2X 3/8" Bicycle Stabilizer Extension Bolt Axle Extensions Suitable for Most 12" to 20" Children's Bicycle Training Wheels

Product Size: The thread on this product is 3/8 inch, or approximately 9.5 mm. Please allow for slight errors due to manual measurement. Applicability: This product fits most children's bicycles with 12- to 20-inch wheels. Product Function: These extension bolts allow you to secure the gears to the bicycle and install stabilizers. Safety: By removing the standard wheel nut from the gear side of the bicycle, you can install the extension bolt. This will extend the axle length beyond the gear drive so the stabilizer does not malfunction. Since children's bicycle axle sizes vary, please ensure the axle size is compatible with the axle they will be using.