Product description Product Name: RC Airplane Landing Gear Wheel StopperInner Diameter: 3.1mm/0.12"Outer Diameter: 7mm/0.28"Height: 5.5mm/0.22"Material: stainless steelColor: Silver Tone Package Content:5 Pcs x RC Airplane Landing Gear Wheel Stoppers10 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.