We supply many sizes bits: A,B,N,H,P/ATK,BTK,B3,N2,N3,NTT, ... 86,T2 101..etc We are the biggest manufacturer of diamond bits,reaming shells,casing shoes,PDC bits,wireline drill rods ... . our current product list as below:1. Impregnated diamond core bits2. Surface set Diamond Bits(coring bits and non-coring bits)3 ... do the best service for you. Hope we can establish a good business relationship. .