Now with cross bracing for added rigidity. Made from anodized, extruded aluminum rails and modular system for easy sliding and adjustments of T4B (with included knobs) and other vises. With foldable tube steel legs for easy transport and storage. Makes vise location adjustments fast and convenient on a solid, lightweight, foldable, and transportable base. Move around the house, shop, take on trips or get optimal flexibility and efficiency for final waxing and fine tuning at the start line!