All of our standard wire shelves come with 4 pair of plastic tapered sleeves per shelf. Order extras to make sure you have these accessory sleeves available whenever the need arises. Snaps together easily around a 1 inch post. We recommend using black shelf sleeves for black and chrome shelving units, and white sleeves with white units. When sold separately, 4 pair per bag (enough for one shelf). 1 inch diameter.