SIZE Each metal pegboard hook is 1 inch (25mm) center spaced holes, the diameter of straight wire is is 3.1mm. Fit for standard 1/8" peg boards with a 1" spacing (The thickness of the plateshould be less than 1/8") Material 50 pcs Metal peg board hooks are made from steel to organize the tools. The Chrome finishes over the hooks shiny and protects from rust