Irwin 10231 Unibit Step Drill Bit

Mfg. Part No.: 10231

Brand: Irwin

Single concave flute design creates perfectly round holes in thin materials including steel, brass, copper, and aluminum. Constructed of industrial grade, high speed molybdenum steel. SpeedPoint tip for fast starts. No. 10231: Minimum Size: 1/8 In., Maximum Size: 1/2 In., Step Range: 1/32 In., Number of Holes: 13 Steps, Shank Diameter: 1/4 In. Hex, Material: High Speed Steel, Pkg Qty: 1, Package Type: Clamshell No. 10232: Minimum Size: 3/16 In., Maximum Size: 1/2 In., Step Range: 1/16 In., Number of Holes: 6 Steps, Shank Diameter: 1/4 In. Hex, Material: High Speed Steel, Pkg Qty: 1, Package Type: Clamshell No. 10233: Minimum Size: 1/4 In., Maximum Size: 3/4 In., Step Range: 1/16 In., Number of Holes: 9 Steps, Shank Diameter: 3/8 In. Hex, Material: High Speed Steel, Pkg Qty: 1, Package Type: Clamshell No. 10234: Minimum Size: 3/16 In., Maximum Size: 7/8 In., Step Range: 1/16 In., Number of Holes: 12 Steps, Shank Diameter: 3/8 In. Hex, Material: High Speed Steel, Pkg Qty: 1, Package Type: Clamshell No. 10239: Minimum Size: 7/8 In., Maximum Size: 1-1/8 In., Step Range: 1/4 In., Number of Holes: 2 Steps, Shank Diameter: 7/16 In. Hex, Material: High Speed Steel, Pkg Qty: 1, Package Type: Clamshell. WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov