Disc cutter features 7 punches , in sizes 1/8"...3/16"...1/4"...5/16"...3/8"...7/16"...1/2" . Has handle to tighten cutter against sheet to hold it in place. The tool's holes have been machined and honed to make fine, clean cuts. The punches are oil-quenched tool steel that have been drawn for hardness and durability. The base is case-hardened and ground. You can cut soft sheet up to 14ga.