How to install bike training wheels Step 1: Connecting the training wheel and support bar together. First assemble the bolt, wheel, Vertical Bracket, Flat Washer and nut in order and then fix them by wrench. Step 2: Remove axle nut and washer from bicycle axle. Step 3: Place Bracket Brace Plate over bike axle by inserting the tab into the open space of the bike frame. Step 4:Place assembled training wheel onto bracket brace plate and adjust bracket height(Fit for single speed 12/ 14/ 16/ 18/ 20 inch children's bicycles). Loosely thread the axle nut onto the axle. Repeat for the other side of the bike. Tip::Adjust the height of the training wheels and tighten the axle nut. The training wheels should be 3/8 to 1/2 inch above the ground on both sides when the bike is upright. Specification: Material:High-Quality ABS Wheels + Plastic Tire Color:Pink Feature: Adjustable Package includes: 2 x Bracket Brace Plates 2 x Nuts 2 x Washers 2 x Shoulder Bolts 2 x Vertical Bracket arms 2 x Wheels