Springfield 1100521-1 Non-Locking 2-7/8" Trac-Lock Slide and Swivel

2-7/8" post mount with bushing for snug fit High-strength aluminum construction Swivel: 360° rotation, adds 1-1/4" height to the pedestal Slide: Large 7-1/4" x 13" seat mounting platform, travels 5-1/4" forward and backward on self-lubricating pads For use with 2-7/8" fixed height pedestal