Bronze alloy worm gear to fit Marvel 8, 8MKI and 8MKII bandsaws. This wear gear is a component that drives the feed system forward through the cross shaft. Gear is worn and needs to be replaced when the system "skips" or "hops" - and it can no longer be readjusted to properly mesh the worm in to the worm gear. Alternate part numbers 8D251 and AMV-8D251