Garelick Low Profile Seat Slide Allows helm or boat seats to adjust fore and aft; Slide mounts under seat in between seat and pedestal base; Convenient handle provides solid locking at any position; Compatible with most 360 spiders; Wobble-Free Design/Operation; Anodized aluminum with stainless steel hardware; Spider swivel casting (99023, 99036) not included; Full Length Size for roto-molded seats 5" (13cm) Fore and Aft Travel; 8.5" W x 13" L x 1.63" H (22cm x 33cm x 4cm); For Low Profile installations where slide mounts directly to deck.; Lock handle is angled upward; Assembly & Installation Instructions