Kudos to Toby N for the original model here - and Grizzle17 for the Gridfinity Refined variant. This is the 1x14.5 3x13.5 1x17.5 model of the plier holder with a gridfinity refined base. This lets you add magnets that are push fit (which I prefer), or to use the little screw fasteners if you want maximum stability. 

Sub-component stuff: 

These are the magnets I use for all my gridfinity stuff: https://amzn.to/3DFTKtO.  

 (Note: These are associate links, which means that they don't cost you any more, but I get a small cut if you purchase via these links. This isn't a big money-spinner, but I find it so useful to have sub-components linked in models that I download - so I know I'm getting exactly the right bits without much research, and it helps support my tinkering!).