Foundation Oversized Adjustable Saw Guide Guiding Your Cuts If you need to cut a steerer tube or a seat post, you'll need a saw guide so you can make perfectly straight cuts. The Foundation Oversized Adjustable Saw Guide is designed for both aerodynamic and round seat posts and round steerer tubes. It can hold aero posts up to 80mm and round tubes from 25. 4mm to 45mm in diameter. Features Works with aerodynamic and round seat posts Compatible with round tubes from 25. 4mm to 45mm in diameter Easy-to-use clamp that holds your posts in place while you saw | Foundation | Oversized Adjustable Saw Guide Oversized Adjustable Saw Guide