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This multi-use Irwin Unibit step drill bit eliminates the need for carrying a variety of drill bits. Engineered with industrial-grade molybdenum steel, this single-fluted bit allows you to drill nine different hole sizes from 1/4 inch to 3/4 inch in increments of 1/16 inch using the same drill bit. Laser-engraved markings clearly show the hole sizes while the easy-to-sharpen tip requires no center punching. The heat-treated construction ensures reliability and durability, allowing for sure starts even on curved surfaces.
Irwin Unibit #3 Step Drill Bit allow you to drill 9 different hole sizes with the same bit
Eliminates the need to have a variety of step drill bits in the toolbox
Engineered with industrial grade high-speed molybdenum steel
Single-fluted cutting edge delivers fast, round holes from 1/4" to 3/4" (6.4 - 19 mm)
Laser-engraved measurements with increments of 1/16" (1.6 mm)
Easy-to-sharpen, non-skid tip eliminates the need for center punching
Heat-treated for maximum durability
Provides sure starts on curved surfaces
3 flatted shanks prevent slipping in drill chuck
Includes 9 steps: 1/4" (6.4 mm), 5/16" (8 mm), 3/8" (9.5 mm), 7/16" (11.1 mm), 1/2" (12.7 mm), 9/16" (14.3 mm), 5/8" (17.2 mm), 11/16" (17.5 mm) and 3/4" (19 mm)
| Part Number | 10233 |
|---|---|
| Advanced Features | No Advanced Features |
| Accessories List | No Accessories Included |
| Advanced Features | No Advanced Features |
| Assembled Height (ft) | 0.10 ft |
| Assembled Height (in) | 1.20 in |
| Assembled Height (in) | 1.20 in |
| Assembled Length (ft) | 0.52 ft |
| Assembled Length (in) | 6.20 in |
| Assembled Length (in) | 6.20 in |
| Assembled Weight (kg) | 0.10 kg |
|---|---|
| Assembled Weight (lb) | 0.22 lb |
| Assembled Width (in) | 3.00 in |
| Assembled Width (in) | 3.00 in |
| Assembled Width (mm) | 76.20 mm |
| Bit Diameter (Size) | 1/4"-3/4" |
| Bit Diameter (Size) | 1/4"-3/4" |
| Coating | Black Oxide |
| Consumer Pack Size | 1 |
| Drill/Driver Bit Type | Step Drill Bits |
| Number of Pieces | 1 |
| Package Depth (cm) | 15.75 cm |
| Package Depth (in) | 6.20 in |
| Package Height (cm) | 2.54 cm |
| Package Height (in) | 1.00 in |
| Package Weight (kg) | 0.08 kg |
| Package Weight (lb) | 0.18 lb |
| Package Width (cm) | 7.62 cm |
| Package Width (in) | 3.00 in |
| Primary Material | High-Speed Steel |
| Product Use(s) | Steel, Plastic, Wood |
| Shank Size (in) | 0.38 in |
| Shank Size (in) | 0.38 in |
| Shank Type | Hex |
Only Show Differences | ||||||
| Ratings | ||||||
| Advanced Features | No Advanced Features | - | - | - | - | |
| Accessories List | No Accessories Included | - | - | - | - | |
| Assembled Height (ft) | 0.10 ft | - | - | - | - |
Subtotal for 4 items$210.93$230.96
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Yes, I recommend this product.

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