uxcell Black Metal 11 Teeth Design 10mm Gear 6mm Dia Pilot Drill Chuch Key Item Name : Chuck Key;Pilot Diameter : 6mm/ 0.24" Gear Dia : Max: 13mm / 0.51", Min: 13 mm / 0.39";Teeth Number : 11 Overall Size : 5.5 x 3.5cm/ 2.2" x 1.4" (L*W);Color : Black Material : Metal;Weight : 20g Package Content : 1 x Chuck Key