X-Acto - Mitre Box - Carded - X-Acto Slotted Mitre Box sides guide razor saw for accurate mitres of model parts, railroad track, moldings, and trim. Formed grooved base holds material in place in widths of 3/16", 5/32", 1/12", 1/8", 3/32", and 1/16". Materials to be cut can be up to 7/8" deep.