Using these wheel adapters is easy. First, take one of the adapters and use the 1.5 mm Allen wrench to loosen the M3 set screws. Slide the adapter onto the 3 mm motor shaft and then tighten the M3 set screws to secure it. Next, place your RC wheel onto the adapter and use the M4 screws to fasten the wheel in place. When handling the adapters, be careful not to over - tighten the screws as it may damage the parts. For maintenance, periodically check the tightness of the screws. If the adapters get dirty, you can clean them with a dry cloth. Store them in a dry place to prevent rusting.