THE EXTREME HEAVY DUTY 4815 is the toughest Bush Hog® built Flex-Wing. Built for the roughest and toughest use, the 4815 is for those users who require the strongest 15 ft. Flex-Wing. The roughest right of way or agricultural cutting is no challenge for this unit that’s built to take the ground pounding heavy use every day! See the back page for specifications and features that set the 4815 above all other 15 ft. Flex-Wings regardless of brand. Bush Hog® – Performance You Can Count On.