uxcell 10mm Pilot Size 11 Teeth Design Metal Drill Chuck Key Item Name : Chuck Key;Pilot Diameter : 10mm / 3/8" Teeth Number : 11;Overall Size : 5.5 x 3.2 x 1.3cm/ 2.2" x 1.3" x 0.5" (L*W*T) Color : Black;Material : Metal Weight : 20g Package Content : 1 x Chuck Key