The LOADSTONE mount plate pack comes with 4 sizes of mount plates. Backed with a 3m adhesive, these metal plates can be installed on anything not magnetic you want to stick to a LOADSTONE
Adhesive did not stick to the magnet or my boat. I had to purchase double sided tape to apply.
The magnet is not strong enough to hold a box of shells unless you were sitting still. It will hold small items like fish hooks.
Don’t waste your money.