This premium quill stem adapter riser made of high quality aluminum alloy- sturdy, solid, high strength but lightweight. Converts mountain / folding threadedless quill setup to threadless. 1 Piece Bike Quill Stem Adapter.
Aluminum Alloy Bike Stem Riser Adapter 22.2/25.4mm to 28.6mm 160mm Handlebar Extender Quill Adapter. It allows conversion from quill stem to threadless stem systems, making it suitable for a wide range of bicycles.