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Stainless steel worm-drive clamps are the standard in connecting ducts to fans and filters.
Eliminates the use of tape that loosens and wears away over time.
To use - simply loosen the clamp with a screwdriver or 1/4 driver slide the clamp over the ducting, position correctly and tighten the screw firmly in a clockwise direction until fixed in place.
Also available in 125mm, 150mm & 200mm