Be Prepared, Always Carry a Spare! If you lose or break your kill switch key, for whatever reason, you wont be able to start your engine. Most marinas dont stock replacement keys, so your much-deserved day out on the boat will be ruined. This lanyard has 7 keys to fit most all BRP, Johnson, Evinrude, Mercury, Yamaha, Honda, Tohatsu, Nissan and Suzuki kill switches. Its equipped with a swivel snap hook to prevent tangles, and rust-free stainless steel crimps. Dont leave the dock without it!