Southco's magnetic door holders are made for marine applications. The magnets are encapsulated in a water tight nylon housing. There are two styles produced a proud mount and a flush mount; the proud mounts right on the surface and sticks out, while the flush fits into a cutout in your door/panel and does not protrude. This page is for part number M5-70-233-2. It includes two flush mounts with small size 20mm x 10mm magnets.