Tough, durable construction for 3/8'' and 1/2'' drill chucks. Removable pilot drill bit for easy replacement. No. 373001: Hole Size: 9/16'' - 1-13/16'', Shank Diameter: 3/8, Pkg Qty: 1, Package Type: Card No. 373002: Hole Size: 9/16'' - 1-13/16'', Shank...