Heavy Duty Spring Loaded Hook. Electroplated heavy-duty construction made with cold rolled steel under ISO 9001 factory standards. Comes in a nice clamshell packaging. Features: For Hitachi Nailers Allows the tool to be safely hung from joists, rafters, trusses, etc. Extends the life of the tool by protecting it from damage resulting from an accidental fall Easily hang tool from rafters for increased productivity. Retractable Hook to move out of the way while not in use, making it more convenient than other hangers