Hydrofarm Active Air Stainless Steel Duct Clamps, 10" (Pack of 2) Stainless steel and rust resistant Worm drive adjustable w/screwdriver Two clamps per pack Secures ducting tightly in place Classic "hose clamp" design Duct clamp Worm drive is adjustable with screwdriver for secure fit Rust resistant Stainless Steel 10-Inch