This mini punch set is useful for cutting small, precise holes in soft materials where throated or plier punches won't reach. Set has a round handle with slot inside to clear punchings. Handle is threaded to accommodate the seven replaceable screw tube sizes shown. Made in the United States by C.S. Osborne. The diameters of the seven tube sizes in inches are 5/64", 3/32", 7/64", 1/8", 5/32", 11/64" & 3/16".