This is the Super Start Electric Starter for the TOWER Terror Monster Truck from Tower Hobbies. FEATURES: Eliminates the use of recoil starter Adapter unit installs easily on rear of crankcase Thumb controlled push button activates the starter motor INCLUDES: One Super Start Unit One Steel Starting Wand One Gearbox Case (replaces the recoil on the back of the engine) One 11 Tooth Gearbox Input Pinion Gear One 32 Tooth Gearbox Spur Gear Two 2.6x6mm Cap Head Screws (2mm hex size) Three 2.6x12mm Cap Head Screws (2mm hex size) REQUIRES: 7.2V flat battery pack with Standard connector, TOWC1030 Battery charger, TOWP0160 Installing gearbox to the engine following the included instructions sheet (the engines one-way bearing will need to be used salvage from the engine or order TOWG0636) Starting Unit Starting Wand SPECS: Length: 8.5" (216mm) 7.25" (184mm) Width: 2.25" (57mm) NA Height: 3.2" (81mm) NA Hex Size: NA .21" (5.5mm) COMMENTS: Do not operate longer than 10 seconds or if engine becomes difficult to turn over. Trying to start a flooded engine or running the starter too long may damage the engine or starter unit. jxs 7/10/06 kpm01/25/2007