Van Norman  PER-FECT-O #7377 MICROMETER for early 777 or 905 Boring Bar Tool Kit.  This is the correct micrometer for early 777 or 905 Boring Bars that use .740" wide Tool Holders.  Adjustment range is 2.600" X 5.350".  Made in USA by The L. S. Starrett Co.  Item is in good usable condition and is sold as is, as shown in photos.  Any questions, call Bill 440-871-4547.  See my other items on eBay.