... reliability High quality and competitive price SpecificationsRock Drilling Tools:Retract Button Bits, Chisel Bits,Drill ... drills, hydraulic rock drills, etc. 5. Diamond core drilling tools including the diamond core bits(BQ, NQ, HQ, PQ, ... TT, T2, T6, etc), reaming shell and core ... . Tricone Drill Bit/Rotary Drilling Rig/Hot Drill Bit