... reliability High quality and competitive price SpecificationsRock Drilling Tools:Retract Button Bits, Chisel Bits,Drill ... Our products cover the following: 1. Top-hammer drilling tools including drill bits, coupling, taper rods, ... hydraulic rock drills, etc. 5. Diamond core drilling tools including the diamond core bits(BQ, NQ, HQ, PQ, TT ... service. Tricone Drill Bit/Rotary Drilling Rig/Hot Drill Bit