- Designed to secure duct components together, such as ducting and fans. - Stainless steel (SAE grade 316) construction with worm drive lock. - Each unit is coated with a rustproof and corrosion-resistant gloss finish. - Easily tighten the clamps using a Phillips or flat-head screwdriver. For Duct Sizes: 4” | Material: Stainless Steel | Pieces Per Pack: 2 Product Description - This duct clamp is designed to secure various ducting components together. It features a heavy-duty stainless steel (SAE grade 316) construction with a worm drive lock. In addition, our clamps must pass a strict quality control process to ensure securing and tightening is smooth, the worm-drive will not get stuck, and will not slip after installation. Dual type screw-head enables both Phillips or flat-head screwdrivers for adjusting the clamps. Each clamp is coated with a rustproof and corrosion-resistant gloss finish. Two clamps are included in each pack. Applications - Used to secure and connect various type of duct components together including ducting, carbon filters, inline duct fans, mounting grilles, backdraft dampers, and more.