WOODPECKER EC7ET Electric Battery Power Hog Ring Gun, 15 Gauge, 3/4-Inch Crown, 7.0-8.0mm Closing DiameterCordless Freedom: The new version of the cordless battery powered hog ring gun reduces the hassle of hoses, compressors, etc. regarding pneumatic nail guns, allowing for flexible operation anywhere High Efficiency: Use 20V MAX 4. 0Ah lithium ion battery, full charge state can drive about 4000 staples, dramatic increases in productivity; the battery also has a USB output port for emergency use Closing Diameter: Standard 15 gauge Electric hog ring gun