A comprehensive overhead shot of the open Bosch MS4091 mixed accessory set, showcasing a professional variety of 91 pieces including titanium, masonry, and brad point drill bits, various screwdriver bits, nut setters, and a ratcheting screwdriver organized within a durable hard case.
Front view of the Bosch 91-piece drilling and driving set in its open carrying case, displaying the systematic organization of high-grade accessories for wood, metal, and masonry applications.
An instructional graphic highlighting that this professional Bosch bit set is best for wood, masonry, and metal, featuring specific icons for each material type to assist with project planning.
A detailed contents chart for the 91-piece drilling and driving mixed set, listing exact quantities and types of drill bits, insert bits, power bits, nut setters, and other essential tools like the magnetic pick-up tool.
An informational graphic emphasizing all-in-one convenience for wood, metal, and masonry projects, featuring the closed hard case with dimensional measurements of 12.60 inches wide, 9.10 inches high, and 2.76 inches deep.
Direct front view of the closed Bosch MS4091 hard storage case, showcasing the rugged blue and black design with red latches and a clear window to easily identify the 91 included accessories.
Perspective view of the high-quality Bosch mixed bit set case, highlighting the portable and secure storage solution designed to protect drilling and driving accessories on the jobsite.
A product comparison graphic displaying four different Bosch drilling and driving mixed sets, ranging from 34-piece to 91-piece options, to help users select the right accessory kit for their needs.
A real-world jobsite view of the Bosch 91-piece accessory set laid open on a metal workbench, demonstrating the easy accessibility of the various professional-grade bits during project execution.
An application shot showing a technician using a Bosch cordless drill with a driver bit from the MS4091 set to install an electrical outlet, demonstrating the practical use of these fastening solutions.
A person using a Bosch cordless drill with a driver bit from the MS4091 mixed accessory set to secure a heavy-duty black metal TV wall mount bracket to a wall.
Close-up of a technician using a Bosch 12V cordless driver and a Phillips head bit from the 91-piece accessory kit to install a brass strike plate on a white residential door.
A professional using a Bosch cordless drill with a specialized brad point wood bit from the MS4091 set to precisely drill a pilot hole into a white dresser drawer for hardware installation.
A collection of various Bosch drilling and driving mixed bit sets, including the 91-piece MS4091 professional kit, displayed open and closed on a wooden workbench in a workshop setting.
A comprehensive overhead shot of the open Bosch MS4091 mixed accessory set, showcasing a professional variety of 91 pieces including titanium, masonry, and brad point drill bits, various screwdriver bits, nut setters, and a ratcheting screwdriver organized within a durable hard case.
Front view of the Bosch 91-piece drilling and driving set in its open carrying case, displaying the systematic organization of high-grade accessories for wood, metal, and masonry applications.
An instructional graphic highlighting that this professional Bosch bit set is best for wood, masonry, and metal, featuring specific icons for each material type to assist with project planning.
A detailed contents chart for the 91-piece drilling and driving mixed set, listing exact quantities and types of drill bits, insert bits, power bits, nut setters, and other essential tools like the magnetic pick-up tool.
An informational graphic emphasizing all-in-one convenience for wood, metal, and masonry projects, featuring the closed hard case with dimensional measurements of 12.60 inches wide, 9.10 inches high, and 2.76 inches deep.
Direct front view of the closed Bosch MS4091 hard storage case, showcasing the rugged blue and black design with red latches and a clear window to easily identify the 91 included accessories.
Perspective view of the high-quality Bosch mixed bit set case, highlighting the portable and secure storage solution designed to protect drilling and driving accessories on the jobsite.
A product comparison graphic displaying four different Bosch drilling and driving mixed sets, ranging from 34-piece to 91-piece options, to help users select the right accessory kit for their needs.
A real-world jobsite view of the Bosch 91-piece accessory set laid open on a metal workbench, demonstrating the easy accessibility of the various professional-grade bits during project execution.
An application shot showing a technician using a Bosch cordless drill with a driver bit from the MS4091 set to install an electrical outlet, demonstrating the practical use of these fastening solutions.
A person using a Bosch cordless drill with a driver bit from the MS4091 mixed accessory set to secure a heavy-duty black metal TV wall mount bracket to a wall.
Close-up of a technician using a Bosch 12V cordless driver and a Phillips head bit from the 91-piece accessory kit to install a brass strike plate on a white residential door.
A professional using a Bosch cordless drill with a specialized brad point wood bit from the MS4091 set to precisely drill a pilot hole into a white dresser drawer for hardware installation.
A collection of various Bosch drilling and driving mixed bit sets, including the 91-piece MS4091 professional kit, displayed open and closed on a wooden workbench in a workshop setting.
BOSCH

Bosch Drill Bit Set MS4091 91 Piece (1/16 to 3/8 In Range Wood Metal Masonry High Speed Steel Carbide Tip Case Fastening Kit)

Only 1 left
SKU: MS4091
$45.29 USD

Description

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Bosch MS4091 91 Piece Drilling and Driving Mixed Accessory Bit Set

The Bosch MS4091 91-Piece Drilling and Driving Mixed Bit Set functions as a multi-material accessory kit engineered to drill pilot holes and drive threaded fasteners into wood, structural steel, sheet metal, and concrete masonry block. Housed in a 3-21/25 lb. impact-resistant plastic hard case measuring 12 in. wide x 2-1/2 in. high, this 91-piece set includes high-speed steel (HSS) metal drill bits, carbide-tipped masonry bits, brad-point wood bits, nut setters, driver bits, a ratcheting screwdriver handle, and a telescoping magnetic pick-up tool. Outfitted with split-point drill tips that eliminate bit walking across 1/16 in. to 3/8 in. hole diameters, this kit enables finish carpenters, HVAC installers, and maintenance contractors to perform drilling and fastening tasks.

Best Used For:

  • Multi-Substrate Rough-In Drilling: Boring pilot holes from 1/16 in. to 3/8 in. diameter into structural wood framing, steel studs, and concrete masonry walls.
  • Cabinet Assembly & Metal Fastening: Driving Phillips, Torx, Pozidriv, slotted, and hex head screws into pre-drilled holes using the ratcheting driver handle or power drill chucks.
  • Confined Jobsite Hardware Retrieval: Utilizing the telescoping magnetic pick-up tool to retrieve dropped steel screws and nuts inside deep stud bays and ductwork.

Key Performance & Safety Features

  • 91-Piece Multi-Material Accessory Selection: Supplies specialized drill and driver bits sized from 1/16 in. to 3/8 in. for wood, sheet metal, structural steel, and masonry block.
  • Precision Split-Point HSS Metal Drill Bits: 135-degree split-tip geometry penetrates smooth sheet steel immediately without center punching or bit wandering.
  • Carbide-Tipped Masonry Drill Bits: Impact-grade carbide tip brazing resists heat buildup while drilling brick, concrete block, and mortar joints.
  • Precision-Machined Driver Bit Profiles: Insert bits feature exact-fit hex, Torx, and Phillips geometries that increase surface contact and reduce screw head cam-out.
  • Ergonomic Ratcheting Screwdriver Handle: Reversible internal ratchet mechanism allows manual fastener driving in tight quarters without repositioning your hand.
  • Impact-Resistant Hard Organizer Case: Molded plastic shell features designated bit slots and secure latches to keep all 91 pieces organized during transport.

What's Included

  • (34) Driver Bits: Phillips, Slotted, Pozidriv, TORX®, and Hex Profiles
  • (30) Drill Bits: Masonry, High-Speed Steel (HSS) Metal, and Brad-Point Wood Bits
  • (8) Nut Setters
  • (1) Magnetic Bit Holder
  • (1) Countersink Bit
  • (1) Ratcheting Screwdriver Handle
  • (1) Telescoping Magnetic Pick-Up Tool
  • (15) Additional Miscellaneous Drilling and Driving Accessories
  • (1) Heavy-Duty Hard Organizer Storage Case

Technical Specifications

Brand Manufacturer Bosch®
Model Part Number OEM SKU MS4091
Tool Kit Classification Type 91-Piece Drilling and Driving Mixed Accessory Bit Set
Total Kit Piece Count 91 Pieces
Drill Bit Size Diameter Range 1/16 in. to 3/8 in. Range
Primary Material Substrate Compatibility Wood, Sheet Metal, Structural Steel, Concrete Masonry, Brick
Drill Bit Core Metallurgy High-Speed Steel (HSS) and Brazed Carbide Tips
Driver Shank Connection Profile 1/4 in. Quick-Change Hex Shank
Storage Case Construction Type Heavy-Duty Impact-Resistant Molded Plastic Hard Case
Package Width Dimension 12 in. (12.0 in.)
Package Height Dimension 2-1/2 in. (2.5 in.)
Assembled Net Package Weight 3-21/25 lbs. (3.84 lbs.)
Manufacturer Warranty Coverage Limited Lifetime Warranty Against Manufacturer Defects

Pro-Tip: When drilling holes into concrete block or mortar joints with the carbide-tipped masonry bits from the Bosch MS4091 kit, run your drill at moderate speeds and clear dust from the hole every 1/2 in. Clearing dust prevents the carbide tip from overheating, maintaining cutting speed across all 30 drill bits in the set.