Design of holders leaves sockets exposed for easy identification. Holds sockets up to 1 or 20mm. Made of strong ABS plastic. Powerful magnet holds sockets in tray. Will fit impact sockets 1/2 Magnetic Socket Holders organizes 1/2 chrome and impact sockets. This has 22 socket compartments, that allow you to keep your 1/2 standard and deep sockets in one convenient holder. Sockets NOT included