Caterpillar style 5 bolt router bit for a scraper; The 7J3023 router bit is most commonly found on a Caterpillar 631 scraper.  It takes 5 - 1" X 3" plow bolts and 5 - 1" hex nuts; the bolt hole spacing is 5.25" from the edge to the center of the 1st hole, 2.5" from 1st to 2nd hole, 3.5" from the 2nd to 3rd hole, 3.5" from the 3rd to 4th hole, 2.5" from the 4th to 5th hole and 5.25" from the 5th hole to the edge; this router bit is 9.5" wide and 22" long