1-marine hardware, boat control box 2-control shift, throttle 3-twin lever, control 2 engines 4-waterproof, 5-antirust The SB-type control head is a heavy duty unit with a positive brake and shut off position for heavy throttle.The throttle lever activated by turning in a clockwise direction. The clutch lever has a black knob and a detent so that the operator can feel the position of neutral, ...