VAR-A-TECH - Series 155 Series 155 VAR-A-TECH Square End Vibration Reducing End Mill. 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 Standard with Advanced AlTiN Coating (Part Number Ends in 4) Standard with Advanced nARCo® Coating (Part Number Ends in 5)