HHIP Perfect for light roughing of steel and stainless steel material. ~ Special chip-breaker with a very tough cutting edge that can reduce cutting force. ~ ISO insert number is WNMG080412DR. ~ I.C. is 1/2". ~ L is 0.343. ~ S is 3/16. ~ d is 13/64. ~ r is .0315. ~ Made of thick TiCN and Al2O3 coating which has a high anti-plastic yield and cutting edge strength and is a preferred universal grade from steel finishing to roughing. ~ It holds steady in tough cutting conditions and can be used for dry-cutting. ~ The cutting speed can increase more than 25% under the same cutting conditions and they will last 30% longer at the same cutting speed.