4 pcs 1 mm Metric Diamond Coated HSS Twist Drill Bits
4pcs Set of Metric 1 mm diameter Diamond Coated HSS Twist Drills Bits4 pcs Set of 1 mm diamond coated HSS twist drill bits.Shank diameter: 1 mmDiamond Coating length: 10mm.Overall lenght: 30mmGreat for glass, marble, tile or rock.Please use a lot of coolant on drill bit and work area, otherwise the drill bit will burn.