Saim 5/8" Gear Dia 11 Teeth T Shaped Grip Metal Drill Chuck Key Pilot Diameter : 8mm / 0.3" Gear Diameter : 16mm / 5/8";Shank Diameter : 10mm / 0.4" Overall Size : 82 x 42mm / 3.2" x 1.6" (L*W);Teeth Number : 11 Package Content : 2 x Chuck Keys