Caliper or dividers too small? This die cast body trammel head set is limited only by the length of the beam you mount them on. It has ground 3" legs with replaceable needle points. Points may be unscrewed and replaced with a furnished pencil holder. An outside head adjustment feature allows up to 5/8" of precision movement even after the heads have been locked to the beam. Use with a 3/8" x 3/4" beam or smaller. Imported