... the bottom board, also can be used in series 1 or series 2 lattice steel plate; steel grid plate of commonly ... x3/16'', 1 1/4''x3/16'', 1 1/2''x3/16'', 1''x1/4'', 1 1/4''x1/ ... 8'', 1 1/4''x1/8'', 1 1/2''x1/8'' etc 2 Bearing Bar Pitch 12.5, 15, 20, ... 15-w-4, 11-w-4, 19-w-2, 15-w-2 etc. 3 Twisted Cross Bar Pitch 38.1, ... 50, 60, 76, 80, 100, 101.6, 120mm, 2'' & 4'' etc 4 Material Grade ASTM A36, A1011, A569, ...