Everbilt 3.5 in. to 4 in. Adjustable Metal Worm Gear Clamps

These Metal Worm Gear Clamps are ideal for attaching aluminum 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 durable metal construction ensures longevity through a variety of uses.