For sale is a 1″ Milling Machine Arbor, No. CAT40 STUB 1X4.000 E. I believe it to be an ISCAR 4501488 but can’t be sure because there is no manufacturer’s branding on the tool. This tool has been used but is in good usable condition. It has a left hand thread. The tool shown in the pictures is the exact one you will receive. It will be shipped promptly from Missouri. Thanks for looking.