This is a Robart Right Robostrut for a 3-1/4" to 3-1/2" wheel. FEATURES: This gear features low weight, aircraft grade chrome-moly steel construction, and heat-treated axle and torque linkages Designed for airplanes weighing 10 - 18 lbs (4.53 - 8.16 kg) For use on grass or paved airfields Perfect replacement for weaker wire, stainless steel, and aluminum type struts Made from real aircraft grade materials, welded and heat treated components also include a 3/16" (4.8mm) dia. wire adapter and a split sleve adapter to fit all popular 1/2 inch (12.7mm) socket type retract units INCLUDES: One Axle Strut hardware package Instruction manual for 1/2" Dia. socket type mount 3/16" Dia. music wire mount REQUIRES: Some possible cutting or soldering SPECS: Overall length when extended: 9-1/8" (232mm) Diameter of tube: 11.1mm (.440") Diameter of shaft: 9.5mm (.375") COMMENTS: This Robostrut is the right main gear, with an offset strut. Fits 3-1/4"-3-1/2" wheels (Robart"s scale wheels would be perfect for that extra scale detail). The left main strut is ROBQ1743. rda05/11/06 ir/jxs