Industry term referring to the additional length added to frame rails or subtracted from mat openings, usually 1/8 of an inch for each side. For example, if the customer orders and 11x14 inch frame, the rails will be cut to 11 1/8 inch and 14 1/8 inch. The 1/8 inch allowance will allow for easy fitting of the artwork, matboard and glazing. For matboards, the opening will be cut 1/8 inch shorter on each side. For example, if the opening is for a 5x7 image, the opening will be 4 3/4 inches x 6 3/4 inches.