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 control Self-lubricated pads provide a smooth, easy glide Made of high-strength aluminum Rotates 360Adeg Powder-coated swivel prevents corrosion Fits 2-7/8" posts Specifications:Platform (inch): Large 7-1/4" x 13" *5-Year Limited WarrantyWARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.