The pneumatic range of retracts are constructed with heat treated aluminum allo... The pneumatic range of retracts are constructed with heat treated aluminum alloy frames and trunnions therefore offering long dependable service for large aircraft, flying off grass or paved runways. These units feature positive up and down locks. Easily adjusted for toe-in with the unique Robart 'split-lock' trunnion. These retracts are available in standard 90deg and 85deg angles, with straight or offset struts.Note: With all of the Robart air retracts you will need to purchase the 'Air Operating Kit' separately. Recommended for 14 to 20lbs (6350 - 9072g) model weight.