Holds 15/16" (I measured right at 15/16"), 1-3/16" (I measured right at 1-3/16") and last slot is stamped 1-5/16" (But I measured 1-3/4"). I believe the large hole was just missed stamped at the factory and should be closer to 1-3/4 Tool holder is in really great condition.
Please look at ALL the pictures. You will get the item that is in the pictures. I do my best to describe the items accurately, and I also post high resolution pictures of the item. If you need additional pictures or have questions please contact me. The item "LARGE ARMSTRONG BROS.HEAVY DUTY BORING BAR HOLDER FOR LATHE NO. 4B" is in sale since Friday, July 3, 2020. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Metalworking Equipment\Metalworking Lathes". The seller is "sgs236" and is located in Fairmont, West Virginia. This item can be shipped to United States, Canada, Mexico, Bermuda.