Stanley 45-530 Steel Rafter/Roofing Square Steel rafter and roofing square provides quick and accurate metric measurements Easy-to-read embossed graduations and figures Work-hardened steel with buffed finish; clear lacquer coat for added rust resistance Includes convenient metric roofing table This Steel Rafter/Roofing Square has a body length of 600 x 50mm and a tongue length of 400 x 8mm