Esselte Rapid Duax Heavy-Duty Staples Box of 1000 (73339) Box of 1000 staples Duax staples are especially designed for the Rapid Heavy duty Rapid Duax stapler Special metal alloy provides ideal staple leg strength and tolerances for precision stapling Each galvanized heavy duty staple fastens two to 170 sheets of 20 lb. paper Crown measures 1/2" wide and leg length is 3/4"