... , coast, mine, water conservancy projects, building foundation, roadbed reinforcement and geological diseases treatment such as landslip, crack, sinkage. It ... L170D64 x L120Drill BitAccording to different condition, choose alloy, steel… Bit, custom design is available.(1)Diameter: R25, R32 ... require.(5)Productivity: 400MT/ month MAXDRILL Self-drilling Rock Bolt button bit,plate,coupler,nut,shank rod