OverviewThe R245-18 T6 M-PM 4330 is a square, indexable milling insert for sandviks's CoroMill® 245 face milling system. It is not a turning insert and it is not interchangeable with other cutter families — the insert pocket geometry, the 18 mm size and the support surface are all specific to CoroMill 245 bodies that take the 18-size insert. The insert is 18 mm square, 6.10 mm thick, with four cutting edges. Four edges per insert is what makes the system economical in