High quality material: The bicycle pedal extender is made of high quality steel material, waterproof, rustproof, durable, can be used for a long time. Wide coverage : These pedal extenders allow you to attach any bike with standard 9 or 16 threaded pedals, such as cruiser, folding, hybrid mountain bike, downhill bikes and trike. (Warm notice: Not applicable to 1 or 2 inch pedals and cranks, not recommended for use with carbon cranks.) Extended 20MM: The crank with 20mm extension gives you a riding experience comfortable and prevent your keel or feet from being scratched by the bike. Easy to install and use: simple structure, very easy and quick to install and detach. Adjusting the bike pedal extenders can help you adjust your riding position and will allow cycling a more natural position. They will work just as well on long rides. Package Included: 1 x Left Bike Pedal Extenders. and 1 x Upright Bike Pedal Extenders (Size: 3.2 x 1.8cm or 1.22 x 0.63in.)