T Shape 11 Teeth Gear Design 6mm Dia Pilot Drill Press Chuck Key 3 Pcs Item Name : Chuck Key;Pilot Diameter : 6 mm / 15/64" Gear Dia : Max: 12.3 mm / 31/64", Min: 10 mm /25 /64";Teeth Number : 11 Overall Size : 5.5 x 3 cm / 2.1" x 1.32" (L*W);Color : Black Material : Metal;Weight : 59g Package Content : 3 x Chuck Keys