Bike pedal extenders are made of high-quality chrome-molybdenum steel, waterproof, anti-rust, anti-corrosive and has a long service life. Extend the crank by 16mm/0.63inch to give you a comfortable ride Used to track the knee outside the pedals to prevent knee strain and reduce friction on the rear tire or frame Avoid scratching your keel or leg against your bike by increasing the length of the pedal shaft. L for left side, R for right side. Left and right shafts (the same side shaft teeth can be superimposed). Crank thread of the protection tooth disc of this product increases the pedal spacing. Gives you a comfortable riding, avoid your keel or leg scratch with your bike. Standard 9/16 inch threaded pedals bike, SPD, MT, BMX, cruiser, dirt jumper, folding, hybrid/comfort, mountain, downhill bikes, folding bike, tricycle, Racing bike. Description: Bike pedal extender tools are featured by L and R markings. Helping you adjust the bike quickly and effectively. Easy to distinguish the right and left extenders, convenient for people to use. They will perform just as well on longer journeys too. Suite for hreaded pedals bike, SPD, MT, BMX, cruiser, dirt jumper, folding, hybrid/comfort, mountain, downhill bikes, folding bike, tricycle, Racing bike. Description: Material: Chrome Molybdenum Steel Size: Approx. 29*18*14mm/1.14*0.7*0.55inch Package includes: 1 Pair Bike Pedal Extenders