Description:ANTI-RUST STEEL MATERIALS - bike pedal extenders are made of high-quality chrome-molybdenum steel, waterproof, anti-rust, anti-corrosive and has a long service life.EXTENDED PEDAL 20MM, PROTECT YOUR KNEE - Extended 20mm form the crank gives you a comfortable riding, avoid your keel or leg scratch with your bike. Used with knees that track outside the pedal by adding length to the pedal axle, prevents knee strain, and reduces rubbing against the rear tire or frame.EASY TO USE AND INSTALL - Featured by unique L and R markings, easy to distinguish the right and left extenders. WIDE APPLICATION- bicycle pedal extenders allow you to attach this set includes any standard 9/16 in threaded pedals bike, BMX, cruiser, dirt jumper, folding, hybrid/comfort, mountain, downhill bikes, folding bike, tricycle, Racing bike. NOTE: Not applicable 1/2" pedals and cranks, Not recommended for use with carbon cranks.REMOVE RIDING RESTRICTIONS, GOING FURTHER AFIELD- Fitting bike pedal extenders can help you adjust your riding stance and will allow cycling a more natural position. They will perform just as well on longer journeys too.Specification:Axle Core Size: 9/16inch (14mm)Extend Pedal Axial Distance :20mm/0.79inch33mm/9.06inch long, 18mm/7.09inch DiameterThread 13mm/5.12inch LongPackage Includes:1 Pair Bike Pedal Extenders