This is the #600 90 Degree Mechanical Retracts for .15-.40 Gas/Electric Powered Models Weighing 2-5 pounds. FEATURES: Positive Up and Down Locks Tough Glass-Filled Nylon Construction Light Weight - 2 oz. Pair 1/8" Tempered Steel Gear Legs Mechanically Operated From Standard Servos INCLUDES: 2 - Mechanically operated main gear 8 - Mounting Screws 1 - Instruction Manual REQUIRES: Possible modifications to aircraft for installation SPECS: Closed Length: 6-5/8" (168.40mm) Open Length: 6-1/2" (165.10mm) Width Base: 1-1/4" (31.75mm) X 1-7/16" (36.58mm) Height Base: 3/4" (19.05mm) Lip on Base: 1/8" (3.18mm) Center/Center same side mouning hole: 15/16" (23.88) Center/Center opposite side mounting holes: 1-3/16" (30.23) Width of Base w/out mounting tabs: 7/8" (22.61) Accuating arm travel approx. 3/4" (19.05) COMMENTS: Uses a clevis or z-bend to actuate the arm. rda5/16/06 ir/jxs