The KUU Ergo Razor Sidewall Cutter is built to remove excess sidewall material cleanly and efficiently so your file hits metal, not plastic. Because when the sidewall interferes, it loads your file, kills consistency, and compromises your edge angle before you even get started. 

Designed with an ergonomic, palm-fit shape, it gives you controlled, stable cutting with every pass. The adjustable setup lets you fine-tune how much material you remove, while the round blade delivers smooth, progressive cuts without chatter or over cutting. 

This is a foundational step in any serious tune, especially if you’re running higher edge angles or working on skis that have seen multiple services. Get this right, and everything that follows gets easier, cleaner, and more precise.