Heavy-Duty Cassette, Staples 30-50 Sheets, 5/16", Yellow 5 Itoya 5/16 inch interchangeable staple cassettes per box Work with Switch XPRESS ST-2, Switch ST-3, Switch Ultra- ST-5, and Etona EC-3 stapler Staples 30-50 sheets of paper at once for commercial, clerical, personal, educational, industrial, and institutional use Precision surgical-grade metal staples can handle any paper-based job Extremely efficient patented design for heavy duty staple jobs Made in Japan