This is the replacement Starter Shaft for the T-MAXX 2.5 engine. FEATURES: Steel Construction YOU WILL RECEIVE: One shaft REQUIREMENTS: Traxxas 2.5 T-MAXX engine SPECIFICATIONS: Length: 25.4 mm (1") Diameter: 18.2 mm (0.716") COMMENTS: If the oneway bearing is needed, use TRAP5211. jmm 02/15/03 ir/jxs &