Product description Split (bleed) keys by AVTODELO are designed for the repair and maintenance of hydraulic and pneumatic systems of vehicles. - Made of chrome-vanadium steel by hot stamping at a reduced billet temperature. - They have a split hexagonal working profile designed for working with threaded fasteners of the vehicle's braking system tubes. - The working profile of the keys is manufactured with increased precision. - The keys are hardened to a hardness of 39-41 HRC. - Protected against 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 braking system is one of the most important safety factors when operating a vehicle.