HART’s useful for quick fastening jobs. Made of stainless steel, these staples are 5/16” long and come in a handy box of 1,250. What’s more, our staples work and most other staplers. In addition to 5/16”, they also come in other sizes, including ¼”, 3/8”, ½” and 9/16”. If you find yourself with extra-thick stapling tasks on your to-do list, then HART’s Heavy-Duty Staples is your absolute best bet. 5/16” heavy-duty staples, 1250 count Fits most manufacturer's heavy-duty staplers and regular staplers Use them to secure carpeting pads, put down roofing shingles, staple upholstery as well as felt, house wrap, insulation, window screening, canvas, weather stripping, etc.