T-H Marine Saf-T-Stop Ignition Kill Switch for Single Outboards This T-H Marine safety ignition cut-off switch is for use with single outboards and meets requirements of existing laws covering mandatory use of emergency stop switches. Comes with an extra strong, coiled, self-retracting lanyard. The attractive black matte finish looks great on any vessel. Mounts in a 1-12 diameter hole Overall dimensions of switch housing are 2-34 x 2 Requires 1-12 behind panel California Residents WARNING Cancer