Adjustable 3.75 in. - 4.5 in. These 4 in. Worm gear clamps are ideal for attaching aluminum, semi-rigid, and galvanized ducts to other aluminum products, including elbows and pipe. Easily adjustable with the turn of a screwdriver, these clamps can be used with all venting applications. A heavy-duty galvanized steel construction ensures longevity through a variety of uses. For optimal performance, it is recommended to use a manual screwdriver to avoid over tightening and stripping the screw Adjustable 3.75 in - 4.5 in worm clamp to fit over different sized ducting Used to fasten ventilation duct Made of heavy duty galvanized steel Oversized for easy fit Heavy duty easily adjustable mechanism for secure fit Sub Type: Adjustable clamp Type: Clamp Fits Maximum Pipe Size: 4-in Fits Minimum Pipe Size: 1-1/2-in Common Use: General Vent For Use with Mobile Homes: No For Use with RVs: No Material: Galvanized Package Quantity: 1 Warranty: 30-day limited With Clamps: Yes CA Residents: Prop 65 Warning(s): No UNSPSC: 27112100