Replacement PCD Inserts for SCM Cutters. The full size insert is the 91066, the SCM cutters also require some 1/2 size inserts which are part numbers 91067 and 91068. If you already have Leitz style Pre Mill Cutters on your machine, please send us a message if you need to know the cutters insert configuration. (How many full and half size inserts you'll need per cutter)