We supply many sizes bits: AQ,BQ,NQ,HQ,PQ/AQTK,BQTK,BQ3,NQ2,NQ3,NQTT,HQ3,HQTT,PQ3,PQTT,T2 46,T2 56,T2 66,T2 76,T2 86,T2 101..etc We are the biggest manufacturer of diamond bits,reaming shells,casing shoes,PDC bits,wireline drill rods,casings,core barrels for mining,exploration industries in China.1. Impregnated diamond core bits2. Surface set Diamond Bits(coring bits and non-coring bits)3. Casing ...