ATOPLEEER11 Collet Set,7pcs Spring Collet Set for CNC Engraving Machine and Milling Lathe Tool,1/8 1/4 1/16 3/16 3/32 5/32 7/32 Inch

I received these a couple of weeks ago and just tried using the 1/4" collet. It was extremely difficult to fit a bit with a 1/4" shaft in to the collet and after trying several times I discovered is not a 1/4 collet but a 6mm collet which is not useful. If they are going continue to sell these they need to advertise them correctly and not mislead their customers.

The 1/4 collet I received is definitely not 1/4". Appears to be a metric collet that's been re-marked, but is not usable with 1/4" tooling.

Cause really bad vibration and runout to increase. Was not able to test before the return window ended so stuck with a 1/8 that is unusable.

The 1/8" collet way out of round, off-center. Worthless. Need to buy better one.

I got what I paid for. Totally worthless ER11 collets. The bores are so rough a precision micro end-bit can only be inserted 1/2 way into the collet. The finish inside the bore looks like 80 grit sandpaper and there are burrs on the compression slots. Do not purchase these collets.

Even though the description says, 1/8 inch and 1/4 inch, when they got here, they're marked 1/8 MM and 1/4 MM. However, they are 1/8 and 1/4 inch as far as I can tell... They look okay, but I've not put them in the router yet. I'll update if there is a problem.

1/8 MM and 1/4 MM does not equate to 1/8 IN and 1/4 IN. The package specifically states that the contents contain 1/ 8 mm and 1/ 4 mm collets. They are NOT 1/8 inch and 1/4 inch collets.

Very good quality material. Received fast. Good price.