SCMT 32.51-EM nc-TiAIN Coated Carbide Insert ~ EM - Semi-Finishing Geometry. Stainless Steel Material ~ EM -Double-side chipbreaker with M-class tolerance serves to reduce cutting force and workpiece adhesion when machining stainless steel. ~ Possesses higher feed and depth of cut capability than EF chipbreaker. ~ XAF798: A combination of 2-4 um nc-TiAIN coating and ultrafine grain carbide substrate with high strength and toughness. ~ Suitable for light to medium milling and boring of all kinds of materials. ~ Recommended for finish and semi-finish turning of stainless steel and roughing turning of high-temperature alloys. ~ ISO Insert No. SCMT09T304EM ~ I.C. is 3/8" ~ L is 3/8" ~ S is 5/32" ~ d is 0.17" ~ r is .0157".