Shockwave Impact Duty Step Bits are engineered to deliver the most durable and fastest impact step bit hole drilling solution. These step drill bits are made with global materials and give best-in-class performance in impact drivers with the versatility to be used in drills. The 1/4 In. hex shank has an optimized SHOCKZONE body providing the industry's most durable shank, reducing early shank breaks. Titanium Aluminum Nitride (TiAlN) coating helps deliver 5X longer life, while the step drill bit's Rapid Strike tip and dual spiral flute produce 2X faster holes. No. 48-89-9241: Minimum Size: 1/8 In., Maximum Size: 1/2 In., Step Range: 1/16 In., Number of Holes: 13 Steps, Shank Diameter: 1/4 In. Hex, Pkg Qty: 1, Package Type: Clamshell No. 48-89-9242: 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, Pkg Qty: 1, Package Type: Clamshell No. 48-89-9243: Minimum Size: 3/16 In., Maximum Size: 3/4 In., Step Range: 1/16 In., Number of Holes: 10 Steps, Shank Diameter: 1/4 In. Hex, Pkg Qty: 1, Package Type: Clamshell No. 48-89-9244: Minimum Size: 3/16 In., Maximum Size: 7/8 In., Step Range: 1/16 In., Number of Holes: 12 Steps, Shank Diameter: 1/4 In. Hex, Pkg Qty: 1, Package Type: Clamshell No. 48-89-9248: Minimum Size: 1/8 In., Maximum Size: 1 In., Step Range: 1/16 In., Number of Holes: 9 Steps, Shank Diameter: 1/4 In. Hex, Pkg Qty: 1, Package Type: Clamshell No. 48-89-9249: Minimum Size: 7/8 In., Maximum Size: 1-1/8 In., Step Range: 1/16 In., Number of Holes: 2 Steps, Shank Diameter: 1/4 In. Hex, Pkg Qty: 1, Package Type: Clamshell