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ER Collets snap into the eccentric ring inside the collet nut. They are difficult to remove if you do not know this simple trick.

Step 1: Line Up Diamonds/triangles on the Collet and the Nut

Align the laser etched diamonds or triangles (different on various brands) on the collet and the collet nut.

Step 2: Push Down on the Collet.

Holding the collet and nut with the diamonds/triangles in the 12 o'clock position, press down on the collet.

Step 3: Snap Out the Collet.

The collet will snap out easily.