This is the replacement One-Way Bearing for the recoil unit on the Super Tigre G-27CX engine - DTXG0255 used in the Duratrax Warhead Truck. FEATURES: Steel hex construction with one-way roller bearing installed INCLUDES: One 6mm one-way bearing REQUIRES: Installation into the recoil unit SPECS: Length: .47" (12mm) Hex size: .47" (12mm) kpm10/26/2005 ir/jxs