Product description The detachable (bleeder) keys from AVTODELO are designed for repairing and servicing hydraulic and pneumatic systems of vehicles. - Made from chrome-vanadium steel through hot stamping at a reduced blank temperature. - They have a detachable hexagonal working profile designed for working with threaded fasteners of the vehicle's braking system. - The working profile of the keys is manufactured with increased precision. - The keys are hardened to a hardness of 39-41 HRC. - They are protected from corrosion by a matte chrome-nickel coating. A bleeder key should be in every car owner's arsenal, as it is no secret that the proper functioning of the braking system is one of the most important safety factors when driving a car.