Precision die-cast aluminum construction with stainless-steel ball joint mounting hardware Convex safety glass mirror for wide-angle viewing Clamp-on mirrors include CNC-machined 6061-T6 aluminum 7/8" or 1" ID P-clamps for mounting on handlebars Clever ball joint assembly inside the mirror perch can be reversed for right-side mounting. MIRROR REC CLAMP ON 1" BK