we are a manufactures of rock bits for oil field, mining and water well drilling rigs, we have steel tooth and insert rock bits with diamater form 15cm to 44cm . ( new and rebuilt) we also buy bad or used rock bits , pdc, drill pipe (73,89,127) , the mud pump(800--1300) and discard over , stuck over due supplies. and enjoy a high reputation as regular supplier to us. canda, middle east regions. we welcome your inquiries.