I've heard, but don't know for sure, that the Grizzly chuck is a Vicmarc copy. Can anyone confirm that? (that's the chuck brand I use and like best.) Vicmarc makes three sizes so it may be a copy of the smaller one. I know Vicmarc makes 1 1/2 inch adapters because I have one. I also have an older Axminster which the new HTC is based on according to the guy who sells them. It is also a great chuck. Let us know you have any issues with the HTC.