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