Warning! The product with serial number TAR-1075702 is not the one in the photo and its description is wrong. Don't blame the warehouse, this website is displaying the wrong item. No wonder it was $10 and everyone else was $20.
I needed this mandrel for a 1 inch hole saw that was too small for other mandrels I already had. The hole saw was threaded and fitted well. This mandrel does not come with a lock nut, so you cannot use it with non-threaded accessories. The drill bit was shorter than expected and was only 1/4 inch longer than the bit I attached.