Stanley roofing square 400 x 600mm stanley 1 45 530 the metric roofing carpenters square is designed for all roofing calculations and also the layout of stairs li made from tempered steel buffed and with a clear protective finish and has 15 tables for rafter cuts roofing pitches and rises etc li it is metric only graduated every 2mm figured every 10mm on both sides stanley 1 45 530 roofing square 400 x 600mm 16 x 24in