This tool is a pressure type sealer which tightens, and seals economical polypropylene strapping around packages or bundles. he overlapped polyester band is welded by heat pressure in appoximately 2 to 5 seconds. Use a 3/4" to 1" wide strap with thickness of .02" to .04". Requires an air-filter-regulator, a minimum hose inside diameter of 1/4" and air pressure of 72 to 100 PSI.