TopGroove™ Machining Guidelines Multiple Tooth Poly–Vee Grooving Let WIDIA™ quote your multiple tooth poly-vee grooving applications. Semi-standard inserts and holders are available. The strong TopGroove design holds the insert rigid and outperforms any other tooling method for this application. Machining Guidelines for Undercutting Operations Performed with Custom Solution and TopGroove NU Inserts (NU3094, NU3125, and NU3156) 25mm diameter minimum 2,54mm 2,54mm NOTE: Items shown are non-standard items. widia.com E89