Engineered For a Wedge-tight fit Wedge-shaped components slide in for a snug, stable fit Type B seat mounts are designed to lock into the post Engineered to prevent unintentional detachment Heavy-duty bushing with peripheral bearing system and exclusive crush ribs are individually sized for exact fit Tubing is precisely-sized and satin-anodized finished Tubing comes in several styles. Pedestals come in several lengths, including patented J-Slot adjustable height Precisely positioned locking tab