Brad point tip provides accurate positioning for starting the hole. Precision machined to provide the most accurate and clean holes. Depth marks are also included on the bit so common depths can be found while bit is in motion. No. 48-15-0125: Bit Size: 1/8", Material: High Speed Steel, Overall Length: 2-3/4", Shank Diameter: 1/8", Flute Length: 2-3/4", Pkg Qty: 1, Package Type: Card No. 48-15-0185: Bit Size: 3/16", Material: High Speed Steel, Overall Length: 3-1/2", Shank Diameter: 3/16", Flute Length: 3-1/2", Pkg Qty: 1, Package Type: Card No. 48-15-0250: Bit Size: 1/4", Material: High Speed Steel, Overall Length: 4", Shank Diameter: 1/4", Flute Length: 4", Pkg Qty: 1, Package Type: Card No. 48-15-0312: Bit Size: 5/16", Material: High Speed Steel, Overall Length: 4-1/2", Shank Diameter: 5/16", Flute Length: 4-1/2", Pkg Qty: 1, Package Type: Card No. 48-15-0375: Bit Size: 3/8", Material: High Speed Steel, Overall Length: 5", Shank Diameter: 3/8", Flute Length: 5", Pkg Qty: 1, Package Type: Card No. 48-15-0437: Bit Size: 7/16", Material: High Speed Steel, Overall Length: 5-1/2", Shank Diameter: 3/8" Reduced, Flute Length: 5-1/2", Pkg Qty: 1, Package Type: Card No. 48-15-0500: Bit Size: 1/2", Material: High Speed Steel, Overall Length: 6", Shank Diameter: 3/8" Reduced, Flute Length: 6", Pkg Qty: 1, Package Type: Card