These Wilwood crush washers help to create leak-free connections for your brake lines. Leaking hydraulic lines are a pain and can be dangerous if not recognized, so Wilwood offers these crush washers to help seal things up. Using aluminum as the gasket material ensures a leak-free connection under the extreme pressures and conditions of your brake systems, so you won't have to worry about it. Don't risk reusing your old washers or lesser gasket material for something as important as your brakes--use the same crush washers that Wilwood trusts in their top-quality brake systems.