How to Read Drill Bit Sizes
Drill bit sizes may be fractional, metric, letter or number; the label determines the actual diameter.
Drill Bits: selection checklist
- Use a size chart when converting between systems.
- Check the actual decimal or metric diameter.
- Select the closest specified size rather than guessing.
How to choose the right option
- Confirm the job specification and machine interface.
- Select the correct size, geometry and material.
- Review the product details and related accessories before ordering.
Shop the recommended collections
- Drill Bits for Metal, Steel & Stainless Steel
- Tap Sets for Metal Threading
- Drill Bit Sets for Metalworking
- Champion Mag Drill Parts
- Twist Drill Bits for Metal
- Drill & Screwdriver Bits for Professional Work
- Drill Chucks for Professional Work
- Drill Presses for Professional Work
- Champion Cutting Tools
Products to compare
- 1/4" HSS Hex Shank Drills
- 10 Piece National Corse Drill & Tap Combination Set
- 23 Pieces 1/4" Hex Shank HSS Drill Set
- 3 Piece Hex Shank Step Drill Set
- 3 Piece Straight Shank Step Drill Set
- 3/4" Capacity Tap Chuck for AC42 Mag Drills
- 5 Piece Machine Screw Drill & Tap Combination Set
- 5 Piece Multi-Purpose Drill Set
Continue learning
- Industrial Drill Bits for Metal
- Tap Sets for Metal Threading
- Drill Bit Sets for Metalworking
- Magnetic Drill Replacement Parts
- Steel Cutting Tools
- Drilling Tools
For production quantities, unusual sizes or help selecting the correct tool, request a quote from Cutting Tools Outlet.