... Clamp,Ducting Made from zinc plated steel, these metal worm drive clamps are the most professional way to secure any ducting. Clamp,Ducting,metal Clamp ... ,nylon clamp,plastic clampMade from zinc plated steel, these metal worm drive clamps are the ... pls contact Deflcto .The step is as following Ducting clamp,metal clamp,plastic ducting clamp,nylon ducting ...