Seller: becksrelics (13,610) 100%, Location: Mansfield, Ohio, Ships to: US & many other countries, Item: 122227301303 5 extra heavy duty antique machine age industrial shelf brackets . The longest side that goes against wall 12 3/8" long , protrude from wall 10" . Marked FBB on one side ; they have old white paint . Unusual and rare brackets , made for holding a lot of weight ; these could be bolted to a concrete wall and hold a bench....or used to hold a significant amount of weight. The holes are approx 3/8" . These were probably used in an old store , industrial setting...Beautiful painted any color..or leave as they are .