Solid chair pedestal with anodized finish columns. Smooth surface outer tube, ribbed inner tube (100/76). The height adjustment is assited by PowerMatic gas strut and locks with shiny polished S/S 316 "Quick Release" locking system.Available with aluminum anodized/polished deck mount base Ø300mm. or free standing with S/S 5-leg base. Aluminum base with S/S cover also available. (Sphinx PX: Seat slide systems not permitted with pedestals with 5-leg base!)