ER collet size question

My holder takes ER 32 collets, which are 40mm long and 33mm diameter.

On E-Bay there are some collets that look like mine, but are 31mm long 21mm diameter #2578385909.

would they be ER 16 or ER 25 ... or ??

anyone know of a web sight giving collet dimensions ?

-- Jonathan

Barnes's theorem; for every foolproof device there is a fool greater than the proof.

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