The Quickset Bar End is a fully custom product from Tilt. The custom T-Bolt is made from 7075 aluminum utilizing a 6mm hex to tighten inside of your handlebars. If you catch your bar spins on the outside of your grips and like bar ends tucked underneath your grips, you'll prefer the 22.2 size. If you want maximum protection for yourself and your handlebars, you'll prefer the 31.0 size. Either way, the Quickset Bar End provides long term protection for you and your bars.