... from 6mm to 20mm, tip type and crown type: Diamond Drill bitOuter diameterWorking lengthSegment heightThreadinchmminchmminchmm 0.2461.97500.3910G1/2", 5 ... basic grade:-1. fast cutting: fast sharp=high daily output, no chipping, good cutting surface, consistency, high production. Most expensive2. ... And concrete, asphalt, brick etc. Let me know if any item any size you are interested, we’ll be glad to ...