We supply many sizes bits: A,B,N,H, ... ,T2 66,T2 76,T2 86,T2 101..etc We are the biggest manufacturer of diamond bits,reaming shells, ... and reaming shells conform to Metric,DCDMA,CDDA standards. * We can manufacture all kinds of products according to customer's ... special requirement. Any requirement please contact us, we'll do the best service for you. Hope we can establish a good business relationship.. ( ...