Anodized aluminum. Super strong neodymium magnets. Perfect for organizing sockets, bits, wrenches and almost any steel tools. Extra low profile rail. You can slide studs within rail and tighten them at any position you want. Studs are also removable. Suitable for being attached to the side of a tool chest, inside drawers, beams, lift posts, etc. Avoids tools sliding and moving around inside tool-chest drawers.