Zhankui Drilling Equipment Co.,ltd. is specialized in designing, manufacturing and marketing of various high quality diamond drill bits for various petroleum drilling activity. Product series classified by cutting elements covers PDC bits, TSP bits, Natural diamond bits, Impregnated diamond bits. Product series classified by purpose covers diamond drill bits, coring bits, bi-center bits and reaming tools while drilling.we also supply tricone bits,TCI bits,steel tooth bits,rock bits and drag bits.and some drilling equipments.Size of various bits and special tools covers from 3 1/2鈥� to 26鈥�, includes standard size and nonstandard size.