1. Bike Foot Pegs measure approx 10 x 2.8 cm (3.9 x 1.1 inches) and fit 3/8 inch axles. Please confirm your bike size in advance. 2. Mountain Bike Pegs are installed on the rear axle of the bicycle. Please make sure that the axle length is greater than 0.5 cm. If it is too short, installation may be improper. 3. Aluminum Alloy Bike Pegs are non slip, which can increase friction and ensure safety. Don’t worry about accidentally falling. 4. Bike Pegs are made of aluminum alloy, which is durable, high in strength, not easy to break, and wear resistant. It has high carrying capacity. Use scenarios - On trail or park riding, the rear peg provides a stable foot rest to aid balance during weight shifts or lightweight tricks on compatible bikes. - During long rides, you can vary your foot position by resting a foot on the peg, helping reduce fatigue and improve control. - For riders who customize their bike with rear axle pegs, these aluminum pegs offer a durable, high strength, wear resistant option with a non slip surface for safer riding.