Using the same idea that makes QF ducting so fast to install, these clamps feature genuine QF clamps in place of nuts and bolts that other hangers use. To use the clamp hanger, simple slide it into place and clamp it. It's that simple! Repositioning is no problem either; simply unclamp the hanger, slide to the new position, and reclamp. Features the HJ style top hat, 6" clamp. US Duct T26508 - 6" Industrial Dust Collection Joist Hanger