The Grizzly 6" 3 jaw chuck is a well-constructed, quality accessory for any wood lathe with a 1 inch 8 TPI headstock. After cleaning the machine oil off, the unit installed in seconds. Adjustments to the chuck are made using the 2 tools provided, which slip into holes along the circumference of the chuck. The adjustment tools fit well and are inserted and removed easily. Tightening and loosening the chuck with these tools is quite easy, and the chuck holds the work piece very securely.
The centering accuracy of this chuck seems to be quite accurate. I haven't tried measuring eccentricity with a dial indicator but it seems quite good.
I have mounted various types of plastic in this chuck and have been very happy with the results.
I would definitely recommend this item to a friend, and I am planning to purchase the 4 jaw version of this as well.