Cast Iron bed rail fasteners, just like they made them in the past. Female Piece: 1-3/16" Wide by 5-3/8" High Male Piece: 1-7/16" Wide by 3-1/16" High Sold as a kit only. The set consists of 4 rail hooks, 4 post anchors -- Enough to assemble one bed. (NO SCREWS) NOTE -- Even though some of the pictures shows screws, this kit no longer come with with mounting screws. Since every bed is different, you might need longer or shorter screws that what used to come with the kit. We sell them separate or you can just get screws from any local hardware store. You can also check out the same type of Iron Bed Rails with different sizes. F-9405 & F-9415. Since everything is made of cast, sometimes a little filing or grinding is necessary to make the mating parts fit properly. FK-088022 (F-9425)