Application For drag racing to lock the front tires of the car,works with 12 24 volt electric systems.It can handle pressure spikes up to 1000 psi Quick Brake Keep the brake pressure on the front or rear brake to keep the vehicle on the start line on the hill or start line Easy To Use This high quality solenoid valve controls both the front brake and the rear brake,make the brakes more convenient Direct Replacement Exquisite workmanship, original standard, you can direct replacement for old or broken one,easy to do a burn out by locking the front tires and releasing the back brakes with this system Package IncludesThe line lock kit contains a heavy duty push button switch, switch bracket, coiled wire, rebuildable linelock valve, fuse holder, and indicator light