uxcell 2pcs Round Shank Woodwork 4.2mmx10mm Countersink Drill Bit Tool w Keys Product Name : Countersink Drill Bit;Used for : Woodwork;Size : 4.2 x 10mm Material : HSS;Shank Diameter : 10mm/0.4";Pilot Bit Diameter : 4.2mm/0.16" Pilot Bit Depth : 19mm/0.8";Counterbore Diameter : 8mm/0.28";Countersink Depth : 17mm/0.7" Key Size : 55 x 20 x 2.8mm/ 2.2" x 0.8" x 0.1"(L*W*D);Overall Size : 73x 13mm/3" x 0.5"(Total Length*Max.Diameter);Color : Black, Silver Tone Net Weight : 82g;Package Content : 2pcs x Countersink Drill Bit2pcs x Keys