Clamp Tube Worm Gear Galv 4in<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Diameter: 4"</li><li>Material: aluminum</li><li>Finish: galvanized</li><li>Usage: for secure connection to flexible aluminum duct</li><li>For use with rigid， semi-rigid and flexible duct</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41iida7hbdL.jpg" noproxy>