This is the replacement Recoil Multi-shaft Crankshaft for the Traxxas 2.5. FEATURES: Steel construction Start shaft pin for recoil starter INCLUDES: One multi-shaft crankshaft One 15mm crankshaft extension One 25mm crankshaft extension REQUIRES: Installation into Traxxas 2.5 Recoiled engine. cmc 12/08/04 ir/jxs BOX DIMENSIONS: 3.13" W. X .88" H. X 6.00" L. BOX WEIGHT: .08 LBS.