uxcell 16mm Gear Diameter 8mm Pilot Spanner Drill Chuck Key Tool Silver Gray Item Name : Chuck Key;Pilot Diameter : 8 mm / 0.24" Gear Dia : Max: 21.5 mm / 0.8", Min: 16 mm / 0.63";Teeth Number : 11 Overall Size : 8.5 x 5.2 cm / 3.3" x 2" (L*W);Color : Silver Gray Material : Metal;Weight : 72g Package Content : 1 x Chuck Key