Metal Panel Mount DC Power Jack - 2.1mm : 321
Metal Panel Mount DC Power Jack  - 2.1mm Center Pin    Comes complete with mounting nut and mounts in a .437 hole.     Specifications:     Center Pin (I.D. Mating Plug): 2.1mm  Inner Diameter: 5.5mm  Mating Plug: #210  Mounting Hole: .437"