16mm 21mm 26mm 31mm 41mm 51mm 61mm RC Model Parts Metal Wheel Lock Collar Shaft Axle Bushing for Landing Gear Stopper Item:Metal Wheel Collar lock Parameters: Color: silver Material: metal Stainless steel shaft sleeve, cylindrical shape, with a tightening hole in the center, already equipped with M3 Mi screws (M3 screws are also available) for clamping the shaft. Size Inner diameter 1.6mm, outer diameter 6mm, thickness 4mm, weight 0.75g Inner diameter 2.1mm, outer diameter 6mm, thickness 4mm, weight 0.7g Inner diameter 2.6mm, outer diameter 7mm, thickness 4mm, weight 0.9g Inner diameter 3.1mm, outer diameter 8mm, thickness 4mm, weight 1.2g Inner diameter 3.6mm, outer diameter 8.5mm, thickness 4mm, weight 1.3g Inner diameter 4.1mm, outer diameter 9mm, thickness 5mm, weight 1.8g Inner diameter 5.1mm, outer diameter 10mm, thickness 5mm, weight 2.1g Inner diameter 6.1mm, outer diameter 10mm, thickness 5mm, weight 2.9g NOTE: 1. OnlyWheel Collar included! 2.Human measurement, errors allowed! Package Included Metal Wheel Collar lock x 10PCS (size as your choice) _x000D_