Bosch Drill Bit Set TI21A 1/2 Inch Max Capacity 21-Piece (Titanium Nitride Coated Split-Point Three-Flat Shank Steel Wood Plastic Tool Set)
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Bosch TI21A 21-Piece Titanium Nitride Coated Twist Drill Bit Set
The Bosch TI21A 21-piece titanium nitride coated metal drill bit set penetrates high-carbon steel, light-gauge metals, dense hardwoods, and abrasive plastics with high-speed precision. Engineered with a self-centering 135-degree split-point tip that eliminates drill bit wandering and a friction-reducing TiN coating that delivers up to 2X longer service life, this 1.18-pound accessory kit ranges from 1/16-inch up to 1/2-inch bit sizes. Outfitted with three-flat shanks on sizes 3/16-inch and larger to prevent chuck slipping under heavy drilling loads, it equips HVAC technicians, maintenance specialists, and general contractors with reliable, burr-free hole making across handheld drills and drill presses.
Best Used For:
- High-Carbon and Sheet Metal Drilling: Boring clean, precise holes through tough carbon steel plates, ductwork, and light-gauge metal framing without center punching.
- Dense Hardwood and Woodworking Fabrication: Drilling splinter-free holes in oak, maple, plywood panels, and composite materials for hardware installation.
- Abrasive Plastic and Acrylic Fabrication: Slicing through nylon, polycarbonate, PVC, and dense plastics cleanly with minimal frictional heat buildup.
Key Performance & Safety Features
- Precision Split-Point Geometry: Starts on contact without walking or skating across smooth metal surfaces, eliminating the need for a pilot hole.
- Titanium Nitride (TiN) Surface Coating: Reduces thermal friction and wear during continuous operation, extending cutting edge sharpness up to 2X.
- Anti-Slip Three-Flat Shanks: Provides three flat contact faces on sizes 3/16-inch and larger to prevent bit spinning inside standard 3-jaw chucks.
- High-Visibility Laser Etchings: Permanent laser-marked fractional diameter readings ensure rapid bit identification and organization.
- Blow-Molded Jobsite Storage Case: Rugged, latching case protects cutting edges and keeps all 21 fractional bits organized inside toolbags.
What's Included
- (2) 1/16 In. Drill Bits
- (2) 5/64 In. Drill Bits
- (1) 3/32 In. Drill Bit
- (1) 7/64 In. Drill Bit
- (2) 1/8 In. Drill Bits
- (1) 9/64 In. Drill Bit
- (1) 5/32 In. Drill Bit
- (1) 11/64 In. Drill Bit
- (2) 3/16 In. Drill Bits
- (1) 13/64 In. Drill Bit
- (1) 7/32 In. Drill Bit
- (1) 15/64 In. Drill Bit
- (2) 1/4 In. Drill Bits
- (1) 5/16 In. Drill Bit
- (1) 3/8 In. Drill Bit
- (1) 1/2 In. Drill Bit
- (1) Heavy-Duty Carrying Case
Technical Specifications
| Manufacturer | Robert Bosch Tool Corporation |
| Model Number | TI21A |
| Product Classification | 21-Piece Twist Drill Bit Set |
| Minimum Bit Diameter | 0.0625 inches (1/16 in / 1.59 mm) |
| Maximum Bit Diameter | 0.500 inches (1/2 in / 12.7 mm) |
| Point Tip Geometry | 135-Degree Split-Point Self-Centering Tip |
| Shank Interface Style | Three-Flat Shank (3/16" and Larger) / Straight Round |
| Bit Base Metallurgy | High-Speed Carbon Steel Alloy |
| Thermal Coating Technology | Titanium Nitride (TiN) Gold Plating |
| Total Kit Piece Count | 21 Drill Bits plus Storage Case |
| Total Assembled Weight | 1.18 lbs (0.54 kg) |
| Storage Case Dimensions | 9.00" L x 4.50" W x 1.75" H |
| Target Substrates | High-Carbon Steel, Sheet Metal, Hardwood, & Plastic |
| Compatible Tool Platforms | Cordless Drills, Corded Drills, & Stationary Drill Presses |
Pro-Tip: When drilling holes larger than 5/16-inch into thick high-carbon steel plates, apply a few drops of cutting fluid and step up from a smaller pilot bit; this keeps the titanium nitride coating cool and prevents burning the cutting flutes.