Hole opener is used for expanding the drilled hole, the cutter are manufactured under the severe quality control. All our hole openers are field maintainable , with easy assembly and disassembly.....
Hei Longjiang North Shuangjia Drilling Tools Co., Ltd. ( Sj-Drilling) is a holding company of Heilongjiang North Tool Co. Ltd. under China South Industry Group Co. The company has a registered....