The Powernail 20-gauge PowerStaples are electroplated, zinc-coated carbon steel staples designed for strength and corrosion resistance. These staples can be used in the Powernail 20FS trigger pull floor stapler. The 20-gauge PowerStaples are designed with a 3/16 in. (4.6 mm) crown and come packaged in boxes containing 2,500 staples. They are suitable for 5/16 in. (8 mm) to 1/2 in. (12.7 mm) flooring thicknesses. One 2,500 count box will cover about 350 square feet.