This deluxe heavy duty hand held corner rounding tool with large 10mm radius weighs under 14 ounces & cuts up to approx 5/64" thick (75 mils) paper, PVC cards or laminated paper material. 10mm radius is 3/8 of an inch (not metal). Has large steel cutting blade and extra wide side guides to make seating your sheet simple and efficient. This large radius is best suited to larger sheets like letter size and for arts and crafts. This tool is built to last a long time.