Razor's Edge Metal Ring Knife. Metal Ring. 3/4'' straight blade. Ring-type knife can be used to cut twine, ribbon, plastic strapping, pallet wrap, tape, cardboard, or light gauge wire. Also used extensively in the food service industry from harvesting to packaging, shipping and warehousing. For many types of jobs, it can increase productivity and at the same time, reduce the risk of repetitive motion injuries. Ring size 14. 12 pieces per box.