Southco's magnetic ball door and window holders allow for an easy adjustment for any mating angle. This page is for the post mounted ball, which offers even greater application flexibility by allowing adjustments in ball height. Measured from the base of the post to the center of the ball, it can be adjusted from 2.5" to 3.5" high. The magnets are enclosed in 316 stainless steel making them perfect for the marine environment. On the flat side of the ball there is a layer of rubber to dampen vibrations and rattling noise when your vessel is underway. The ball comes with either a proud or flush strike; 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. Please see below for specific product information.