These dual-function (single lever controls throttle and shift) enable one-handed engine control. Start and warm-up are done by pulling out the hand levers in the neutral position. This disengages the clutch and allows throttle to be advanced in neutral. Returning to neutral detent re-engages the clutch. Built-in friction drag helps prevent slippage and throttle creep while underway.Functions: Dual-function Lever Material: Chrome-plated brass Dimensions: Base: Single 6 3/16"L x 3 9/16"W; Twin 6 3/16"L x 4 13/16"W Mounting Style: Top-mount Cable Type: 33, 3300 type (SAE 10-32 thread); single can also use 4300 type (SAE 1/4-28 thread)