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 postEngineered to prevent unintentional detachmentHeavy-duty bushing with peripheral bearing system and exclusive “crush ribs”are individually sized for exact fitTubing is precisely-sized and satin-anodized finishedTubing comes in several styles. Pedestals come in several lengths, including patented “J-Slot”adjustable heightPrecisely positioned locking tab positively locks post to baseWedge bushing locks in with a tight, solid fit2-Point stainless steel riveting strengthens the bushingStrong base design has reinforcing ribs and improved profile to withstand the toughest conditionsBead blasting closes aluminum porosity. Brushing process provides long-lasting high-sheen finishWARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov