The bolt from Schmidt is stainless steel, and the socket is 4mm, so it will not work with a hexlox magnet. Hexlox doesn't make a magnetic adapter for 4mm socket. The hexlox bolt has a 5mm socket and is made of steel, so it is compatible with the hexlox magnet.
The Schmidt set appears to have a knurled nut without anti turning tabs, so it can be easily removed with pliers.