... -manufactured with a middle stop to prevent walking along the thread. Include couplings sleeve(threaded R22,R25,R28,R32,R38,T38 ... kinds of round cutter bit and flat cutter bits for excavate coal machine as the replacements of kennametal. Such as U76, ... kinds of casing bits for shield machine and construction tools.7. Round road planing bit for road milling machine and trenching machine. Shank dia: 19 ...