These heavy-duty hose clamps come fitted with a thumb screw adjuster that eliminates the need for a screwdriver or wrench to tighten and loosen. The worm gear mechanism provides superior clamping force to keep your dust collection hoses securely in place. A perfect choice for both permanently attaching hoses, while also allowing for quick disassembly of your dust collection system should it become clogged or in need of maintenance. Available to fit either 4” or 2-1/2” dust collection hoses, these clamps make installing and maintaining your dust collection system a breeze.