... : ISO9001of DTH pipe 4.Material:Carbide DTH drill rods1,Top-hammer drilling tools including thread button bits(R25,R28,R32,R38,T38 ... adapter, etc2,DTH drilling tools including Air DTH hammer,DTH bits with COP, DHD, QL, MACH, MISSION, SD, XL shanks.Water DTH ... , ODS system, etc3,Drag bits including Step and Chevron types with "API Reg", "NRod" thread.Claw tybe bits, Clay bits,etc4,Diamond core drilling ...