Overview: Biltwell Bar End Utility Mirrors boast clockworks precision and timeless retro style to stand out or blend in on any stock or custom motorcycle you can imagine. Precision die-cast aluminum construction with stainless-steel ball joint mounting hardware. Tempered glass mirrors is 3.75” round. Clever ball joint assembly inside the mirror perch can be reversed for mounting in the up position. Self-adjusting wedge mounting system fits a wide range of handlebar I.D.s.