Similar to the simple “one touch” actuation of our aluminum quick release mounts, these units are manufactured from 316 stainless steel. The hinge snaps into the base and stays attached to the bimini top when the two are separated. The base mounts directly onto the surface of the boat and can be mounted on either a horizontal or vertical surface. It swivels 360°. The bases are 3 9/16”L X 1 3/16”W X 1/2”H and mount with two #10 screws (not included). Mounts are sold individually.