Package Includes of The Roll Control Kit : Solenoid Valve Black Color * 1 Snap-Action Switch * 1 Indicator Light * 1 Fuse (4 amps) * 1 Mounting Screws * 1 Brake Lines & Fittings * 1 Application Summary: Used in Drag racing to positively lock the front wheels, producing a more effective burnout. These installation kits are designed to make installing a line lock on most American made vehicles much easier. This kit contains brake lines and various brass fittings, connectors, adapters, unions and plugs necessary for an easy installation.