This is a set of 4 shelf support pegs. I bought these to add shelves to a bookshelf, but the size didn't fit, so I'd like to offer them to someone who needs them. According to the website where I purchased them, the material and size are as follows: Iron, nickel-plated φ2.9 x 9 / φ4.0 x 8 mm Reversible peg Flange thickness 0.7 Thank you for looking.