This is a 20-Gauge Hammer Tacker that drives 3/8" wide staples. Its full alloy body can stand up to demanding environments like roofing while remaining light enough to be used continuously. This stapler has a thick handle to absorb impact and reduce impact vibration. Staples are bottom loaded for convenience and to reduce jams. This is the perfect tool for floor installers, roofers and those who need a professional-grade hammer tacker for general projects.