Drill bit (Sintered, 1/2″ GAS, L75, Threaded) L75*100mm

Use imported diamond sand and copper bond to sinter and form a ring cutter under high temperature and pressure condition. Size from 3mm to 150mm, it’s optional. Threaded drill bits applies International Standard to suit for all Chinese drilling machine. High concentricity. Suggestion: adjusting drill pressure gradually to have drills tried.