CNMA543-AC415K, CNMA160612 AC415K aka CNMA543 AC415K, aka 192R225 is a .047″ corner radius 5/8″ I.C. FLAT TOP Super FF coated Turning insert for high speed (up to 600- 2,000 sfm) interrupted cut for machining in Cast Iron materials. This insert needs a minimum of .047″ doc to cut properly but can cut up to .240″doc at .004-.015″fpm. This is a Super FF Coated insert.