All BBT custom built, high energy starters begin with CNC Machined aircraft grade aluminum blanks. After machining, we add an industry-proven high torque, gear reduction starter motor. For ease of use, a lightweight push button switch is also added to the unit. All our drive shafts feature a 1/2" drive for your desired socket. The starter unit comes ready to race with a standard 10 amp/hr battery to get you on the track.