This is the HPI Roto Start 2 Electric Shaft Drive Starter System for the HPI Nitro Star K series engines with a pull starter. Replaces pull starter with a durable metal gear backplate Upgraded version of the original Rotostart with an improved case and a circuit breaker for overload protection Thumb-start button has safety cover to prevent accidental starting HPI Roto Start 2 Electric Shaft Drive Start with long shaft, metal gear backplate with mounting hardware, 2mm hex wrench, Z164 heavy duty grease and illustrated instruction manual 7.2V rechargeable stick battery pack (DTXC2030) and charger (DTXP4011) Rotor Start 2 Shaft Length: 7.9" (201mm) Length: 9" (229mm) Width: 2.36" (60mm) Diameter: 0.20" (5.5mm) Height: 4" (105mm) cnh 11/18/08 &