Diamond Drill Bit1 fast drilling speed,2 high efficiency and less chipping,3 minimum material deformation4 long life We specialize in the production of diamond drillSharp,wear-resistingDon't 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. 5000+ ---- ...