These Imperial Metal Worm Gear Clamps are ideal for a wide range of applications, including clothes dryer, bath fan venting, and more. Use these multipurpose clamps to fasten ventilation ducts or to secure ducts to clothes dryer exhaust ports, bath fans, or other vents. Designed for lasting reliability, these sturdy duct clamps feature durable all-steel construction and can withstand up to 40 lbs of torque per square inch. They are compatible with semi-rigid or rigid aluminum ducts and are easily adjustable with a screwdriver to ensure a secure fit every time.