Double end carbon steel keys with chemically blackened finish. Suitable for sump plugs on engine gearbox and back axle. Use with 19mm socket on ratchet driver. Supplied in storage case.6pc Double End Oil Drain Plug Key Set• Double end carbon steel keys with chemically blackened finish.• Suitable for sump plugs on engine gearbox and back axle.• Use with 19mm socket on ratchet driver.• Supplied in storage case.• Model No. AK658Model No: AK658:Brand: Sealey:Contents: Hex; 5/16PTDSEAAK658