Swingline Staples 5/16" Heavy Duty For use in: Swingline Electric Staplegun & Swingline Heavy Duty Stapleguns Also can be used in: Sears Craftsman, Montgomery Ward, Master Mechanic, U.S.M.-Bostik, Duofast & Hansen Stapleguns Size: 5/16" Contents: 1000 staples per box