Hunan Kuangbao Precision Drilling Machinery Co., Ltd Company Profile Hunan Kuangbao Precision Drilling Machinery Co., Ltd.(KBJZ) ,which was established in 2010 and located in Xiangtan City ,China, is a professional manufacturer that develops, produces and sells drill bits, drilling rigs and drilling tools.Our products include PDC bits, PDC coring bits, impregnated diamond core bit, casing...