hat
Sèvi ak machin salyè/Marine sèvi ak machin chenn igè Lachin, materyèl yo gen l' 4145H, AISI4145H modifye fe ak Non manyetik. Sèvi ak machin colliers tip yo se Marine sèvi ak machin chenn, Slick, Flex ak manke/pèdi pa ak asansè rekreyasyon /or.
eng
China Vigor’s Drill Collar/Spiral Drill Collar, materials include AISI 4145H, AISI4145H modified steel and Non-magnetic. Drill collars type they are Spiral Drill collar,Slick,Flex and with Slip and /or Elevator Recess.