... our products:1.stocks adequate, time delivery2.rich experience in drill bit3.good after-sales service4.long work life5.Cutter's ... /2 (215.9mm)WOB(KN/mm)0.35~1.05Pin shank size4 1/2Rotate speed(r/min)300~60API formal outer ... : we can supply rock bits, tricone bits, steel PDC bits, drill bits, TCI bits,drilling bits, oilfield bits, steel tooth bits ...