This is a Robart left strut for a 3-3/4" to 4" wheel. Replace your wire landing gear struts with units that duplicate the shock absorbing action of landing gear on real aircraft - Robart"s Robostruts. This gear can smooth out bumps & hard landings, improves ground tracking, and pro- tects your valuable landing gear from shock damage. These Robostruts are scale or semi-scale in appearance, which makes them perfect for your 12-15 pound sport, scale, or jet. They can also be retrofitted for your retract system. FEATURES: This gear features low weight, aircraft grade chrome-moly steel construction, and heat-treated axle and torque linkages. One per package. INCLUDES: One Axle. Strut hardware package. Instruction manual. REQUIRES: 3/16" main gear wire plus Retracts SPECS: Overall length when extended: 235mm (9.25") Diameter of tube: 11.1mm (.440") Diameter of shaft: 9.5mm (.375") COMMENTS: This Robostrut is the left main gear, with an offset strut (P-51 style), and fits 3-3/4"-4" wheels (Robart"s scale wheels would be perfect for that extra scale detail). The right main strut is ROBQ1930. RobartPart ROB663L