Product description Product Name: RC Airplane Landing Gear Wheel StopperInner Diameter: 5.1mm/0.2"Outer Diameter: 10mm/0.39"Height: 5.5mm/0.22"Material: stainless steelColor: Silver Tone Package Content:10 Pcs x RC Airplane Landing Gear Wheel Stoppers20 Pcs x M3 Screws USAGE: When installing the wheel, use the wheel lock to lock the internal limit or circumference of the wheel for a fixed function.REPLACEMENT ACCESSORY: A good accessory for a remote-controlled aircraft that is used to replace old and bad parts.