... descriptionHebei Zhankui Drill Equipment Co., Ltd specializes in drill bits, new and renew tricone bits, PDC bits, single roller bit, drag ... bit, hammer union, drill pipe, drill collar, safety clamps, elevator, mud pump and stabilizers for water well, oil field ... work, in addition to giving increasedprotection against fishing jobs.Safety Clamps are used for pipes in different size. Size: 3 1 ...