1 fast drilling speed, 2 high efficiency and less chipping, 3 minimum material deformation 4 long life Feature:Sharp,wear-resistingNo jumping edgeLong service liferequire lower WOB,high rotary speed and small flow rate, good concentricityWildly used in cutting glassDiameter: 5mm - 100mm.Total length: 70mm,75mm,90mm,95mmDig holes. 4000+ ---- 8000+Classed by suitable equipments :1. Straight shank2. ...