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https://www.rpmhardware.com/er20a-collet-nut-m25-x-1-5-pitch from www.rpmhardware.com
ER20A collet nut has an internal thread of M25 x 1.5. 2. Outside diameter is 1.33" (34mm). 3. ER20A collet nut holds all ER16 collets.
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