This is a large scale retractable tailwheel with forked axle for the tailwheel and air cylinder. For use with planes upto 40 lbs. FEATURES: This Unit Comes Pre-Assembled with an Air Cylinder and Tailwheel Axle Attached. Steerable with a Pull-Pull System Attached to the Rudder Servo. INCLUDES: One Retractable Tailwheel w/Air Cylinder and Tailwheel Fork Axle One Instruction/Parts List Sheet REQUIRES: Pressure Tubing to Reach from the Main Control Unit to the Air Ram One 2" Tailwheel Plastic Sleeved Pull-Pull Steel Steering Cables(Goes to Rudder Servo) Four #6-32 Mounting Screws Four #6-32 Blind Nuts Four 3/8" x 1/2" Maple Mounting Blocks Four Dowel Pins (Used to Mount Maple Mounting Blocks to Bulkhead) Epoxy SPECS: Retract Mounting Brace Height: 2-11/16" (68.5mm) Retract Mounting Brace Width: 2" Height from Axle Center to Bottom Retract Brace: 2-1/8" approx. Extended Length from Axle Center to Retract Brace Mount: 3-11/16" Retracted Length from Axle Center to Retract Brace Mount: 4-1/8" COMMENTS: On the Air Cylinder: Extend Fitting is Located Forward and the Retract Fitting is Located Aft. For the Offset Axle Version, use ROBQ2225.RobartPart ROB160WC