1/4-inch Hex Shank Screw Countersink Drill Bit #8 for Woodworker 2 Pcs Product Name : Countersink Drill Bit;Standard : 8#;Used for : Woodwork Material : HSS;Shank Diameter : 6mm/1/4" Pilot Bit Diameter : 2.78mm/ 0.1";Key Hole Diameter : 2.5mm/0.1" Overall Size : 61x 9mm/2.4" x 0.35"(Total Length*Max.Diameter);Color : Black, Silver Tone Net Weight : 27g;Package Content : 2 x Countersink Drill Bit