13-499 3/8in. x 3/8in. 18 Gauge Electro-galvanized Crown Staple, A11 Style Tacker Staple, 5,000/Box. Application: These A11-style tacker staples are great for installing insulation, roofing, felt paper, poly sheeting, and vapor barriers. Length: It can be used with most 18 Gauge 3/8inch. crown staplers. Feature: Its jam free guarantee and standard glue collation. It's better use with the Zeluga Hammer Tacker. Treatment: Resistant to rust and corrosion due to electro-galvanized. Electro-galvanized finish is ideal for general construction applications including upholstery, sub-floor, furniture, trim and molding and ceiling tile insulation. Count: It includes 5,000 staples per box.