I bought this kit - description copied and pasted from the email back in March of 2015:
DEUP-0611-843KIT Dewalt 611 Ultra-Precision Collet Kit
(contains 1/8in. 1/4 in. & 3/16 in. UP collets, collet nut Talon spanner wrench,
calibration blank and 118 ml of ColletCare) $129.95.
It looks like they don’t offer the 3/16" collet anymore. To be fair though, I have only used it once so far, and that was because I had it that I even ordered the 3/16" shank end mill. Otherwise I would have just ordered a 1/4" shank end mill.
I lost my wrench, and I had to order another one (actually ordered two more so if I lost another I wouldn’t be dead in the water again), and while I was at it, I ordered two more collet nuts because I hated having to pull out the collet from the nut because I was changing the end mill sizes 2-3 times a day when I was making cribbage boards due to the specific order of operations. It was totally worth getting the extra collet nuts.
Also, I found my original wrench, so now I have three. . .
I am definitely happy with the PreciseBits collets. I would also wholeheartedly recommend the SuperPID. That thing really makes adjusting the RPM of the Dewalt easy. Just turn the knob and see the readout on the display.
I am planning on upgrading to a water cooled spindle soon (within the year) and I will be looking for some quality ER20 collets.