DTH shroud drill rodOD508mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,320 dth hex for pile foundation work

DTH shroud drill rodOD406mm 1-4M with 135 hexagonal hex,320 dth hex for pile foundation work DTH shroud drill rodOD426mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,320 dth hex for pile foundation work DTH shroud drill rodOD450mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,320 dth hex for pile foundation work DTH shroud drill rodOD508mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,320 dth hex for pile foundation work DTH shroud drill pipe OD508mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,320 dth hex DTH shroud drill rodOD558mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,320 dth hex DTH shroud drill rodOD610mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,320 dth hex DTH shroud drill rodOD660mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,320 dth hex DTH shroud drill rodOD711mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,320 dth hex DTH shroud drill pipe OD508mm 1-4M with 135 hexagonal,170dth hex 273 hexagonal hex,32...