Product Description Split (bleed) keys "AVTODELO" are designed for repair and maintenance of hydraulic and pneumatic systems in vehicles. - Made from chrome-vanadium steel using the hot stamping method at reduced blank temperature. - Have a split hexagonal working profile designed for working with threaded fasteners of the vehicle's brake system. - The working profile of the keys is made with increased accuracy. - The keys are hardened to a hardness of 39-41 HRC. - Protected from corrosion by a matte chrome-nickel coating. A bleed key should be in the arsenal of every car owner, as it is no secret that the proper functioning of the brake system is one of the most important safety factors when driving a vehicle.