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4 Pcs Spare Keys Set Includes 4 red battery isolator switch spare keys. Keep extras in your car, toolbox, or boat for quick replacement. 10mm Shaft Compatibility Designed with a 10mm shaft to fit most standard battery disconnect switches. Ensures a secure, snug fit. Durable Red Construction Made from sturdy material with a bright red finish. Easy to spot and built to withstand frequent use. Quick & Easy Replacement Simply insert and turn to cut off power. No tools required. Ideal for emergency use or lost key situations. Wide Vehicle Application Fits cars, trucks, boats, RVs, marine vessels, campers, and vans. A practical spare for any vehicle with a battery isolator.