Product description The AVTODELO split (bleed) keys are designed for repairing and servicing hydraulic and pneumatic systems of vehicles. - Made of chrome-vanadium steel using the hot forging method at reduced blank temperature. - Have a split hexagonal working profile designed to work with threaded fasteners of the vehicle's brake system pipes. - The working profile of the keys is manufactured with increased precision. - The keys are hardened to a hardness of 39-41 HRC. - Protected from corrosion with a matte chrome-nickel coating. A bleed key should be in 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 car.