Descriptions:Fits for drills, flex shafts, bench drill and hanging mill.Suitable for drilling holes on glass, shells, rocks, marble, stones, etc.Note: Add the coolant can increase work efficiency and extend service life.Specifications:Color: Silver ToneMaterial: Diamond, High Speed SteelDrill Bit Diameter: 1.7mm / 0.067-inchDrill Bit Length: 14mm / 0.55-inchShank Diameter: 1.2mm / 0.047-inchTotal Length: 38mm / 1.5-inchPackage Content:10 x Diamond Twist Drill Bits.
eBay