• CORNER RADIUS - 4 FLUTE with LONG SHANK- STUB CUT LENGTH, ALTiALN+SH COATING - INCH • Variable helix tools • High precision with excellent surface finish due to each 4F variable helix geometry • Corner radius to reduce corner chipping • Unique patented design decreases chatter and resonance • Strong cutting edge design • Excellent performance on mild mold steels & stainless steelsReplacement: XXR524A016015