Wald 10252 Training WheelsWald 10252 training wheels are the highest quality training wheels manufactured in the world today. This model fits 16",18 & 20" childrens bicycles. Full alloy arms and extension brackets are attached to the wheels axle on one end and to extremely durable rubber/steel wheels on the other. These brackets are capable of mounting to many wider alloy and steel chainstays. Made in the USA.046307102528