Fukaisu 2pcs Bicycle Axle Extenders Kit, Bicycle Axle Extenders for Training Wheels with Screws & Washers for Most 30.48-50.8cm/12-20in Wheel Diameters

["Package Contents: The package contains 2 pieces of bicycle axle extenders, 2 screws, and 2 washers. The complete kit can meet your daily replacement needs.","Excellent Material: The bike axle extenders and screws are made of high-strength iron, while the washers are made of good-quality stainless steel, allowing for long-term use in outdoor or muddy environments.","Wide Application: The axle extender for training wheels is not only suitable for daily cycling training at home, but also for children's bicycle rental shops, kindergartens, or community children's activity centers to modify different brands and models of children's bicycles.","Perfect Fit: The bike axle extenders are suitable for most children's bicycles with 30.48-50.8cm/12-20in wheel diameters, allowing you to retain the gears on the bike and fit your stabilizers. If the bicycle's bearings are too short or the bicycle is multi-speed, additional screws and limiters should be used.","Solving Installation Problems: This bike axle extension tool can effectively extend the axle when your bicycle's rear axle is too short, or when the axle length is occupied by the derailleur, providing sufficient mounting space for the auxiliary wheel."]