PSI Woodworking CLTEZSETA EZ-Glide Pen Turner's 2pc Toolrest Set, 5/8" Diameter Post (15.875mm)
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5/8 inch is the diameter of the tool post on these. In terms of tool posts, I think the Revo 12/16 may have a one inch post. You might consider this one, Laguna lathes other than what I've read on their technical pages.
Regardless of the inventory/warehouse/ordering process employed by Amazon, both can certainly be correct without knowing their specifics.