Robart #681 5/8" (15.8 mm) diameter RoboStruts. Can be used for giant size airplanes weighing up to 55 pounds (25kg). With real functional oleos and torque links, that can be used on grass or paved airfields. Made from real aircraft grade materials, welded and heat treated components.

Length: ~31.5cm;  Axle: ~6.4mm