Professional grade Heavy Duty hammer tacker with an auto retractable built in blade Extendable blade that retracts when not in use ¿ easy and secure Blade release allows user to remove blade with the push of a button Professionals can staple down roofing paper with the Hammer Tacker and then cut away any excess materials with the blade. Housing design secures blade, allows for easy removal, and replacement of blade Limited Lifetime Warranty, Weight: 4 lbs., Manufacturer: Stanley Hand Tools