Very happy with this set so far. I started with this set for my HF mini grinder. The only complaint I had was that it didn't come with a 3/4" so I had to buy it separately. I paid less than $100 for the chuck and collet. Fit and finish was good. I have since received my ER20 sets of chucks and collets from overseas and these smaller collets work just as well and give me more insight into my projects so I use the ER20 almost exclusively now but I like the idea of going up to 3/4 to be able to go "if I have to while ER20 ends in 1/2".