This is a Pair of 90 Degree Rotating Pneumatic Retracts for the Top Flite 1/5th Scale Giant Corsair (TOPA0410). FEATURES: Made for 20-40 lbs Giant Scale Top Flite Corsair Self-Centering Steering Made of Aircraft Steel and Aluminum Pre-Primed Gray, with Positive Up and Down Lock. Functional Oleo Struts INCLUDES: Two Main Gear Pneumatic Retracts for the Top Flite Giant Corsair Two 1/4" Nuts Two 1/4" Washers Two 1/4" x 2-7/16" Axle Bolts Two 1/4" x 20" Axles SPECS: Retract Mechanism: Unit: Length: 4-3/4" Width: 2-11/16" Height: 2-1/4" Unit Mounting Flange: Width: 2-5/8" Length: 4" Unit Mounting Holes: Side to Side: 2-5/16" Front to Rear: 3-3/16" Unit with Strut: Length: 8-1/2" Weight per Pair: 28.4oz. Struts: Length: 7-1/8" x Diameter: 7/16"or 1/2" Made for 4-1/2" Wheels Weight bearing Capacity: 20-40 pounds REQUIRES: One Servo for Air Valve Control One Air Control Kit (ROBQ2305) One Hand Pump w/Gauge (ROBQ2363) COMMENTS: For the Tailwheel Retract #160 WC ROBQ2230 from Robart. For the Fixed Landing Gear, use #675 from Robart. Updated JBM 1-9-06 JAL 12/15/98 ir/jl