Amazon.com.au:Customer reviews: TronicsPros 10 Male + 10 Female 12V DC Power Connector Plug 24V 5.5 x 2.1mm Barrel Jack Adapter Socket DIY Screw Terminal Connector for CCTV Camera, LED Strip Light, DVR, Car Monitor System, etc.
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I got this because another reviewer cited using it with his router to make cycling the power easier. My router is in a central wiring panel in a coat closet. Every time I needed to cycle the power to the router due to my playstation or TV brower freezing, I had to remove coats and get into an awkward position to open the panel cycle the router power. HOWEVER, this product fits a pin in the router if that pin is 2.1 MM. Mine is 2.5 MM so after getting this swicth, I had to also get this adaptor (see following info, also on Amazon). Now it works and the switch sits on the wall just outside the edge of the central wiring panel. So much easier. https://www.amazon.com/gp/product/B01NAC0OLC/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 It is called: Coax Barrel Plug Adapter from 25mm to 2.1mm Power Plug by Creative Lighting Solutions $2.50, with shipping and tax it was $6.23.
I was hoping to use it make it easier to reset some equipment by cycling their power input. But these did fit many of the 5.5m plugs due to the variety of inner post size. If they fit the plug, then they work fine. I removed a star just to alert other potential purchasers.