We supply many sizes bits: A,B,N,H,P/ATK,BTK,B3,N2,N3,NTT,H3,HTT,P3,PTT,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. our current product list as below:1. Impregnated diamond core bits2. Surface set Diamond Bits(coring bits and non- ...