The Spec Ops Heavy Duty Staples, 9/16 inch are compatible with all Spec Ops Staple Guns. Manufactured with superior quality high carbon wire and galvanized to reduce buckling and jamming these, *T50 style, galvanized steel staples are best used for any flooring, woodworking, carpentry and upholstery work, among any other construction job. With a 9/16-inch leg length, these heavy-duty staples ensure for a long-lasting durable hold that is also resistant to rust. Each box includes 5,000 staples. With each Spec Ops Tools purchase made, we support our nation's heroes by donating 3% of proceeds to veteran and first responder causes. *T50 is a registered trademark of Arrow Fastener companyThe Spec Ops Heavy Duty Staples, 9/16 inch are compatible with all Spec Ops Staple Guns. Manufactured with superior quality high carbon wire and galvanized to reduce buckling and jamming these, *T50 style, galvanized steel staples are best used for any flooring, woodworking, carpentry and upholstery work, among any other construction job. *T50 is a registered trademark of Arrow Fastener company