Product Description The AVTODELO split (bleeder) keys are designed for the repair and maintenance of hydraulic and pneumatic systems in vehicles. - Made from chrome-vanadium steel using hot stamping at a reduced blank temperature. - 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. - Protected from corrosion with a matte chrome-nickel coating. A bleeder key should be part of every car owner's arsenal because it is no secret that the proper functioning of the braking system is one of the most important safety factors when operating a vehicle.