This is a used steel indicator holder. Solid steel and just under 1" thick. Fitting South Bend 9" A, B and C models and LIGHT 10" lathes or their clones. The clones could include Boxfords and Hercus depending on model. Additional measurements are available; ask before purchasing as sales are final. I have fitted it to my South Bend 9A and my Boxford 10" (10K clone) with great results. The dial indicator hole is 5/16 id. The relief area on the side of the holder is to clear the wiper on the South Bend lathes for more travel. Unfinished steel, recommend painting to match your lathe after purchase.This works great and beats the cruddy plastic holders you see most often. Indicator is not included, holder only. Will not fit other lathes. Holder will be padded well, wrapped in cardboard and shipped in a heavy duty mailer. Insured for purchase price. I DO NOT send offers to anyone.