We supply many sizes bits: AQ,BQ,NQ,HQ,PQ/AQTK,BQTK,BQ3,NQ2,NQ3, ... ..etc We are the biggest manufacturer of diamond bits,reaming shells,casing shoes,PDC bits,wireline drill rods,casings,core barrels for ... .1. Impregnated diamond core bits2. Surface set Diamond Bits(coring bits and non-coring bits)3. Casing(Rod) shoes/Casing bits4. Reaming shellsCoupling,Adaptor ...