Trac-Lock Swivel/Slide Non-Locking Mount for 2-7/8" PostTrac-Lock locking slide and swivel seat mount is for a 2-7/8 in. post.Features:Travels 5-1/4″ Forward and backward with fingertip controlSelf-lubricated pads provide a smooth, easy glideMade of high-strength aluminumRotates 360°Powder-coated swivel prevents corrosionFits 2-7/8″ postsSpecifications:Platform (inch): Large 7-1/4″ x 13″ *5-Year Limited Warranty The Springfield Trac-lock Swivel/slide Non-locking Mount is a boat seat mount designed for use with a 2-7/8" diameter post. This mount allows for the seat to swivel and slide on the track for comfortable positioning. The Trac-lock feature allows the seat to be securely locked in place in one of several positions along the track. The non-locking version of this mount does not have the Trac-lock feature and the seat can be moved freely along the track without locking in place. This mount is commonly used on boats and can be easily installed using basic tools. It is important to ensure that the mount is securely installed and rated for the weight of the intended occupant.