Southco's magnetic door holders are made for boats, shrouded in marine grade 316 stainless steel. 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 M5-70-034-8. It includes a flush with a large 30mm x 15mm magnet, and a flush with a small 20 mm x 10 mm magnet. The flange plate on the smaller magnet is the large size, so the two halves look the same when installed.