Suitable size: Tihs Aluminum Boat Seat Pedestal (Fore & AFT Seat Slide with Locking Seat Mount) Suitable for Fit 2-7/8 Inch Diameter Pedestal Post.The slider and boat seat bracket can be disassembled and used separately.Pre-Drilled hole pattern to mount seat or hardware?there are more reserved holes on the sliding plates, which have a wider range of . We also have a complete set of Aluminum Adjustable Height Locking Boat Seat Pedestal, ASIN: B0BZ3DLBZP Aluminum Adjustable Height Locking Boat Seat Pedestal with Slide, ASIN: B0BZ3K5H23 Rotable: This boat chair base has a 360 degree rotation of the lock knob, They enable you to rotate your seat 360 degrees with a swivel feature, which can enhance your mobility and access to different areas of your boat. 7 Inches sliding adjustments:This Aluminum Boat Seat Pedestal (Fore & AFT Seat Slide with Locking Seat Mount) can adjust the seat forward and backward by pulling the handle upward, with an adjustable range of 7 inches Size: Fit 2-7/8 Inch Diameter Pedestal Post. 360° rotation with locking knob. Slide: 13" x 7" Platform ,7 inches sliding adjustments. This Adjustable Height Locking Boat Seat Pedestal is made of Strong and durable Anodized Aluminum for durability