I appreciated the schematic included in the description photos. I would have had no way of knowing it would fit my lathe without it. I have a Grizzly G0765 7x14 mini-lathe that is the same size as many of the Chinese mini-lathes. This bolted perfectly right on the face plate. I gauged it to make sure it was running true, and it does. Mine came with a wrench, so no need to purchase one. The only thing I would change about it is some way to grip the base while using the wrench on the nut. It is slick and with an oil film on your hands and the base and no grooves to hold with a wrench it is hard to hold while turning the nut with the wrench. I solved this with an old oil filter wrench that I taped a couple of pieces of old inner tube to for grip. It holds the base tightly so I can wrench it tight or loose. Easy in and out on the collets, it does a great job and runs true. Happy with it and it stays on my metal lathe 90% of the time.

This ER32 collet chuck fits perfectly on my Harbor Freight 7x10 mini lathe.
Just used some M6 bolts and nuts to attach it.

You really do have to drill a hole for a Tommy bar.
I first used a center punch, then a pilot then a few bits to get to about 1/4".
It's the smallest steel rod I had. I turned the rod a little so it would fit the hole.
Also knurled the top half. Probably not totally necessary but its makes griping it easier and looks nicer.

I think its about 9-10" long. I wanted it long enough that it couldn't rotate around the chuck.
It's a safety thing, no matter where it goes, it will hit something and not whip around.

Note that it does come with a collet wrench but I would get a better one.
I bought this one https://smile.amazon.com/gp/product/B01M6CKW3S/ref=ppx_od_b_detailpages00?ie=UTF8&psc=1
I am very happy with it.

First off I am not a machinist by trade but... my Grandfather in the day had one of the largest machine shops in New England... I know what its like to hold a tenths.. With that said I ordered this adapter and used the standard screws that came with my lathe for the 4 jaw chuck and everything lined up perfect.. no visible play.. So I measured the outside adapter and only got 1 thou.. then I measured the nut on the spindle and that was 8 thou.. but its only the lock nut... Then I measured the inside and only out 2 tenths... I am waiting for the collet set to show up so I can chuck a pin and measure... but for what it is I could not be any happier.. So if you have a G0768 all you need is the 100mm version and should have everything else you need with the parts that came with the lathe...

The ER-40 with 132mm diameter mounted up nicely to my Smithy 1220. It was a bit tight to Smithy's chuck mount so I mounted it in my 4 jaw chuck and lightly sanded the 132mm diameter to make a nice fit. The tapped holes are too big for the Smithy so I just through bolted it. Works great and the inside taper has a runout of only 0.0002" so very pleased.

I bought this (80mm, ER32) for my minilathe almost 3 years ago and I finally attached it and I was pleasantly surprised by how tight the tolerances are. Very nicely made and I'm glad I got it.