Klein 33801 40-piece ProFlex impact bit set neatly organized in an open MODbox case showing bits and magnetic nut drivers.
Diagram highlighting key features of the Klein 33801 kit, including S2 impact steel bits, nut drivers, and MODbox integration.
Diagram detailing exact bit profiles in the Klein 33801 set, including 25 standard bits, 11 extended bits, and 3 nut drivers.
Klein 33801 impact driving components laid out beside an open MODbox storage case showing all 40 pieces and extension shaft.
Angled view of the Klein 33801 set inside an open clear-top MODbox case showing internal bit bars and black oxide finish.
Selection of extended power bits and a magnetic bit extension holder from the Klein 33801 set displaying laser-etched sizes.
Assorted 2-inch intermediate power bits including square drive and TORX profiles with orange ProFlex torsion zones.
Seven S2 steel 1-inch insert bits displaying precision ground TORX star drive profiles ranging from T15 to T30.
Klein magnetic nut drivers, slotted insert bits, and a 3/8-inch square impact socket adapter with 1/4-inch hex shanks.
Seven S2 steel Robertson square drive and TORX insert bits showing laser-stamped size markings for quick identification.
Klein Tools 33801 ProFlex 40-piece bit set in an open MODbox case with tilt-up rubber rails for easy bit selection and organization.
Klein MODbox modular rolling tool storage stack demonstrating custom jobsite organization with interlocked hard cases and tool tote bags.
Klein Tools Manufacturing promotional video
Klein 33801 40-piece ProFlex impact bit set neatly organized in an open MODbox case showing bits and magnetic nut drivers.
Diagram highlighting key features of the Klein 33801 kit, including S2 impact steel bits, nut drivers, and MODbox integration.
Diagram detailing exact bit profiles in the Klein 33801 set, including 25 standard bits, 11 extended bits, and 3 nut drivers.
Klein 33801 impact driving components laid out beside an open MODbox storage case showing all 40 pieces and extension shaft.
Angled view of the Klein 33801 set inside an open clear-top MODbox case showing internal bit bars and black oxide finish.
Selection of extended power bits and a magnetic bit extension holder from the Klein 33801 set displaying laser-etched sizes.
Assorted 2-inch intermediate power bits including square drive and TORX profiles with orange ProFlex torsion zones.
Seven S2 steel 1-inch insert bits displaying precision ground TORX star drive profiles ranging from T15 to T30.
Klein magnetic nut drivers, slotted insert bits, and a 3/8-inch square impact socket adapter with 1/4-inch hex shanks.
Seven S2 steel Robertson square drive and TORX insert bits showing laser-stamped size markings for quick identification.
Klein Tools 33801 ProFlex 40-piece bit set in an open MODbox case with tilt-up rubber rails for easy bit selection and organization.
Klein MODbox modular rolling tool storage stack demonstrating custom jobsite organization with interlocked hard cases and tool tote bags.
Klein Tools Manufacturing promotional video
KLEIN TOOLS

Klein Tools Impact Driver Bit Set 33801 ProFlex 40 Piece S2 Steel (1/4 5/16 Inch Nut Drivers 3.5 Inch Power Bits MODbox Storage Case Holder Kit)

Only 2 left
SKU: 33801
$24.98 USD

Description

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Klein Tools 33801 ProFlex 40-Piece S2 Steel Impact Driver Bit Set

The Klein Tools 33801 ProFlex 40-Piece Impact Driver Bit Set serves as a heavy-duty mechanical driving kit engineered to install and remove threaded hardware across commercial electrical panels, HVAC ducting, and structural framing. Stored inside a MODbox-compatible modular organizer case measuring 7 inches long by 3.75 inches wide by 1.75 inches high and weighing 1.08 lbs, this system includes impact-rated S2 tool steel bits with energy-absorbing ProFlex torsion zones, extended 3.5 inch power bits, magnetic nut drivers, a 3/8 inch square impact adapter, and a 3 inch magnetic bit holder extension. Designed to withstand rotational torque spikes, this multi-drive set enables electricians, HVAC installers, and carpenters to transfer high torque directly to fasteners using 1/4 inch power impact drivers without stripping screw heads or snapping bit tips.

Best Used For:

  • High-Torque Impact Screwdriving: Fastening self-tapping sheet metal screws, wood framing lag bolts, and structural cabinet hardware using 1/4 inch power impact drivers.
  • Extended Deep Reach Fastening: Reaching deep electrical junction boxes and narrow stud bays using extended 3.5 inch #2 Phillips and #2 Robertson square bits.
  • Hex Nut and Socket Driving: Driving 1/4 inch and 5/16 inch hex sheet metal screws or adapting to 3/8 inch square drive impact sockets for structural bolt assembly.

Key Performance & Safety Features

  • ProFlex Torsion Zone Recoil System: Specialized S2 steel bit shank geometry flexes under peak impact torque loads to absorb stress forces and extend bit life.
  • Impact-Rated S2 Tool Steel: Heat-treated alloy steel construction resists tip wear, rounding, and shearing under high-torque power tool applications.
  • Extended 3.5 Inch Power Bits: Features extended 3.5 inch #2 Phillips and #2 Robertson square bits for direct clearance in deep, hard-to-reach work areas.
  • Minimal Chamfer Magnetic Nut Drivers: 1/4 inch and 5/16 inch power nut drivers feature reduced internal hex chamfering to maximize surface contact on thin hex fasteners.
  • 3 Inch Magnetic Bit Holder Extension: High-strength permanent magnet retains 1/4 inch hex insert bits and holds metal fasteners securely during one-handed starting.
  • MODbox Compatible Modular Storage Case: Rugged impact-resistant storage box features steel hinge pins, a stay-shut front latch, and stackable interlocking feet.

What's Included

  • (1) 3 Inch Stainless Steel Magnetic Bit Extension Holder
  • (1) 3/8 Inch Square Drive Impact Adapter
  • (2) Magnetic Power Nut Drivers (1/4 inch, 5/16 inch)
  • (2) 3.5 Inch Power Bits (#2 Phillips, #2 Robertson Square)
  • (3) Phillips Bits (#1, #2, #3)
  • (3) Slotted Bits (3/16 inch, 1/4 inch, 5/16 inch)
  • (3) Square Bits (#1, #2, #3)
  • (5) TORX® Bits (T15, T20, T25, T27, T30)
  • (20) Assorted Standard Insert Bits
  • (1) MODbox™ Compatible Stackable Organizer Case

Technical Specifications

Brand Manufacturer Klein Tools®
Model Part Number OEM SKU 33801
Tool Kit Classification Type 40-Piece ProFlex S2 Steel Impact Driver Bit Set
System Compatibility Platform 1/4 inch Impact Drivers, Drills & MODbox™ System
Core Metallurgy Material Impact-Rated S2 Tool Steel
Bit Shank Stress Resistance ProFlex Energy-Absorbing Torsion Zone Technology
Primary Drive Shank Interface 1/4 inch Quick-Connect Hex Power Shank
Included Power Nut Driver Sizes 1/4 inch and 5/16 inch Magnetic Nut Drivers
Included Socket Adapter Interface 1/4 inch Hex to 3/8 inch Square Drive Impact Adapter
Included Extended Power Bits 3.5 inch #2 Phillips and 3.5 inch #2 Robertson Square
Included Phillips Tip Sizes #1, #2, #3
Included Slotted Tip Sizes 3/16 inch, 1/4 inch, 5/16 inch
Included Square Robertson Sizes #1, #2, #3
Included TORX® Star Sizes T15, T20, T25, T27, T30
Fastener Magnetization Yes (3 inch Bit Holder & Magnetic Power Nut Drivers)
High-Voltage Insulated Frame No (Uninsulated - do not use on energized electrical circuits)
Total Kit Piece Count 40 Pieces
Modular Storage Case Dimensions 7.0 inches L x 3.75 inches W x 1.75 inches H (17.8 x 9.5 x 4.4 cm)
Assembled Net Package Weight 1.08 lbs (0.5 kg)
Global Trade Item Number GTIN 00092644338014

Pro-Tip: When driving screws into hard timber framing or dense sheet metal studs, switch to the extended 3.5 inch #2 Phillips or square power bit. The added length eliminates the need for bulky bit chuck extensions in tight corners while providing direct sightlines along the screw axis to prevent off-center cam-out.