www.kbjzpdcbit.com 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 shoes,, DTH bits, tricone bits, reaming...