Perfect fit on my Atlas 10 inch lathe with 1 1/2"-8 threads. I haven't put a dial indicator on it yet but it looks like it is running dead true. Through hole means I can hold stock out to the spindle bore size, 11/16" or so on the Atlas. First project now is a stop to go inside the collets. Thank you to this Company for making this product available, I've been looking for something like this for years. I've been watching Ebay and the Atlas collet attachments are over priced, for me this is the only way to go.
F. Varndell 
