Swingline Premium Commercial Full Strip Stapler, 20-Sheet Capacity, BlackReliable workhorse brings you consistent stapling performance in a rugged, durable all-metal, die-cast body. Its no-nonsense construction features a performance-driven mechanism with an inner rail for jam-resistant stability and long-term stapling integrity. A positive locking latch ensures the confidence and control of a secure stapling position. Staples 2-20 sheets of 20-lb. paper when using S.F. 4 Premium Staples. Stapler Type: Full Strip; Staple Capacity: Full Strip (210 Staples); Size of Staple Used: 1/4"; Type of Staple Used: S.F. 4 Premium Staples.