VAR-A-TECH - Series 156 Series 156 VAR-A-TECH Vibration Reducing End Mill with Corner Radius. View Speeds and Feeds page. Features: Reduces Chatter & Vibration Allows for Roughing and Finishing at the same time. Allows for aggressive machining with greater depths-of-cuts and heavier feeds Great for Titanium, High Temperature Alloys, Steels, Stainless Steels, High Strength Alloys and Cast Iron Available in Multiple Raidius sizes Standard with Advanced AlTiN (Part Numbers end in 4) and nACRo® (Part Number ends in 5) Coatings