Double Sided Cutting Mat, 18" x 24"The 18" x 24" Omnigrid double sided cutting mat is ideal for larger scale sewing and quilting projects because it accommodates a standard folded width of 45" fabric. It is a convenient size for sewing and quilting classes, workshops and retreats. It's also perfect for spacious home studios. It features a 1" grid, and 1 8" edge markings and angle line markings on one side; the opposite side is metric, with a centimeter grid, millimeter edge markings