Light, durable and compact pneumatic Robart main retract. Perfect for 5 to 10 lbs. (2270-4540g) aircraft. A durable, glass-filled nylon housing supports an aluminum pivot bearing, which secures the tempered steel 3/16" (4.75mm) wire struts. Each unit has a positive up-and-down lock and a smooth cam action mechanism. Set up for 90° degrees of movement, compensates for 0° to 2° wing dihedral. Ideal as a main retract for any 60 Size model airplanes.