This 3-foot black dock bumper features a 2" channel to slide over square posts or round pipe. Made from high-density polyethylene, it provides reliable impact protection for docks and pilings. Each slot lip is approximately 5/8" and includes a small air hole to release pressure upon impact, giving slight flex and cushioning. An economical solution for protecting marine structures. For superior protection, see our Hercules Solid Foam Dock Bumpers.