Craftsman Professional Stapler/Brad Nailer, Heavy-Duty, EasyFire&trade; Forward Action&trade; with Rapid-Fire Speed load staple/nail track system, staples/nails remaining window, anti-slip handle Forward Action applies pressure directly over work surface Use heavy duty narrow crown staple sizes 1/4, 5/16, 3/8, 1/2 and 9/16 in. Heavy duty steel construction and integrated wire guide Uses 9/16 in. EasyFire brad nails