Product description Autodelo split (bleed) keys are designed for repairing and servicing hydraulic and pneumatic systems of vehicles. - Made from chrome-vanadium steel using the hot stamping method at a reduced billet temperature. - Have a split hexagonal working profile intended for working with threaded fittings of the vehicle's brake system. - The working profile of the keys is made with increased precision. - Keys are hardened to a hardness of 39-41 HRC. - Protected against corrosion by a matte chrome-nickel coating. A bleed key should be a part of every car owner's arsenal, as it is no secret that the functionality of the brake system is one of the most important safety factors when driving a vehicle.