... round cutter bit and flat cutter bits for excavate coal machine as the replacements of kennametal. Such as U76, U82, U84 ... coal bolting rod.6. All kinds of casing bits for shield machine and construction tools.7. Round road planning bit for road ... milling machine and machine.Shank diameter=19.4mm, 25mm, 30mm, 33mm, 38mm, etc ...