1" Inch 25mm Chrome/Black motorcycle Handlebar Hand Risers Universal The product is easy to install and disassemble, without drilling or welding, not easy to fall off, CNC machined aluminum alloy, anti-rust, resistance, high strength and durability." Motorbike Handlebar Risers is A safe and reliable way to fit a narrower bar to a wider stem. Simply place one shim each side of clamp area on handlebar and insert into stem, tighten as normal.