Joker Machine Risers - Pullback - Bridge - Black - 03-866-1B Fully CNC-machined Racing styled design. Made from solid 6061-T6 bar stock for maximum strength. Fits 1" handlebars. Riser bases are threaded 1/2"-13 for Harley-Davidson upper tree applications. Lightweight bridge style top clamp. Top clamp measures 1.1" x 2.4". Made in the U.S...