Platte River 867421, Hardware, Shelf And Support, Shelf Pins, 7mm Library Shelf Supports, 20-pack Easily build library style adjustable shelves with these sturdy supports. Specifications: Bore Diameter=7 mm, Finish=BRASS PLATED, Material=STEEL Specifications: Overall Length=7/8 in, Pin Length=3/8 in, Support Length=1/2 in Specifications: Support Width=3/8 in