Descriptions: Fits for drills, flex shafts, bench drills, and hanging mills. Suitable for drilling holes in glass, shells, etc. Note: Adding the coolant can increase work efficiency and extend service life. Specifications: Color: Silver Tone Material: Diamond, High-Speed Steel Drill Bit Diameter: 1.7mm / 0.07",2.1mm / 0.08" Drill Bit Length: 16mm / 0.63", 20mm / 0.79" Shank Diameter: 1.28mm / 0.05",1.8mm / 0.07" Total Length: 38.5mm / 1.52",45.5mm / 1.79" Package Content:2 x Diamond Twist Drill Bits
