This is an original Ammco USA made double taper adapter set.
Hard to find an original these days.  This is not an imported knock-off.

Kit includes:

1 - 9192 Double Taper Adapter 1.711” x 2.073”
1 - 9193 Double Taper Adapter 2.074” x 2.440”
1 - 9194 Double Taper Adapter 2.441” x 2.897”
1 - 9921 Double Taper Adapter 1.322” 1.670”
1 - 9922 Double Taper Adapter 1.362” 1.710”

Fits any brake lathe with a 1" arbor, including Ammco brake lathe models 1000, 3000, 4000, 4000B, 4100, 7000, 7500, 7700

We have sold Ammco brake lathes and lathe accessories for almost 50 years.  Still have some original Ammco items left from when they still manufactured brake lathes.  Back when they were of the highest quality.  Don't like the price - make us an offer!!  Would like to get this stuff off the shelf.

Thanks for looking!