I have purchased clamps from Revain which are difficult to adjust - very frustrating. They can move about 8 1/2 inches in circumference, which translates to about 2 1/2 inches in diameter. Sorry I didn't measure the ups and downs, it's been a long day. This is significantly more than stated, so it could be an accident. But when I need more clamps, I buy from this guy. I'm used to American style hose clamps and expect a 5/16" hex for this size. They're 7mm if that matters.
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