5 Flute Rougher-Finisher for Steels & High Strength Alloys - Series 121 Series 121 5 Flute Rougher-Finisher for Steels & High Strength Alloys. View Speeds and Feeds page. Features: Bridges the gap between full roughing and finishing applications Maintains an exceptional part surface finish Relieves tool pressure during machining Corner Radius is standard for improved edge protection Excellent when machining Inconel, Titanium and Stainless Steel Available with TiCN (Part Number ending in 2), AlTiN (Part Number ending in 4) and nACRo® (Part Number ending in 5) coatings