PATENTED CLAMP DESIGN - This adjustable bicycle kickstand is designed specifically for kids' bikes. With its unique patented clamp design (PAT. 17/403, 883), you can trust that this kickstand provides a reliable and sturdy attachment for keeping your child's bike upright and secure. Our innovative 3 bolts + 4 screws new design ensures superior stability and durability, outperforming the average 3-bolt clamp designs that tend to be unstable and flimsy. COMPATIBILITY - Designed to fit wheel sizes between 16" to 20", this kickstand is perfect for a wide range of kids' bikes. It is IMPORTANT to note that it is compatible with rear chain stay thicknesses ranging from 15mm to 25mm, with a maximum height of 30mm.