If you have a 12″ Lathe with 1″ diameter post, such as any of those made by Jet, Delta, General, Oneway, Rockwell or the Rikon Midi these rests should probably fit.
NOTE: Older American Made Powermatic 45 and 90 lathes use 1 1/8” posts.
The Box Rests are offset so that you can turn the rim and the inside all in one set up. A removable pin is provided to keep you from going off the edge. Sizes to fit most lathes. The rest is 1.5” wide and overhangs 5”