Product Description AVTODELO split (bleed) keys are designed for repairing and servicing hydraulic and pneumatic systems of vehicles. - Made of chrome-vanadium steel using the hot stamping method at reduced billet temperatures. - They have a split hexagonal working profile designed for working with threaded fittings 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 against corrosion with a matte chrome-nickel coating. A bleed key should be part of every car owner's arsenal because it is no secret that the condition of the braking system is one of the most important safety factors when driving a car.