Swingline 35550 High Capacity 3/8" Optima Staples, Box of 2500. For optimal stapling performance in the following Swingline Optima staplers: 77701, 77715, 87870, 87875, 48210. Stronger wire for easier paper penetration and reduced jamming. 3/8" leg length. 125 staples per strip. 2,500 staples in a reusable metal box. 20 boxes per case.