These are very good clamps with good strong bands that won't fall apart, break, twist or twist. They are slightly heavier than similar sized brackets that can be used to vent a dryer. The loop can be completely removed from the screwing device and then easily replaced - so you can open it and put on something of the right size. 10-pack for less than $15. It seems that they can be cheap or high quality, but they are very high quality. Tightening the screw to the limit provides a secure fit - the band does not deform and prevents the screw from moving any further, as is the case with very light clamps.
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