These are used the is signs of glue on the back side. The Vintage SPANGER 850 Tool Hanger Organizer by Hotchkiss is a set of two heavy-duty steel tool holders designed for wall mounting. Made of durable steel material and featuring a distinctive red color, these organizers are perfect for organizing and storing tools in a workshop or garage. With the Hotchkiss brand known for quality and reliability, this tool hanger set ensures that your tools are securely held in place and easily accessible for your convenience.