3X (20Pcs 1mm/0.04Inch Punte Diamantate Acciaio Alta Velocità HSS per Glass8977
3X([MATERIAL]- Diamond coated high speed steel(HSS) is made by spiral technology, has both toughness and hardness, is not easy to break. The drill bit is, and is easy for chip removal. 20 x Diamond Twist Drill Bits).