The Hardcore heavy-duty lockouts are constructed from steel and have heat-treated chromoly steel internals. The hubs feature back-cut teeth to withstand extreme loading and default to lock so they won't let go. They provide a low profile bevel design to minimize impact with obstacles and a proprietary coating on the locking gears for decreased friction and long life. They come with a five-year warranty.
More info: www.yukongear.com.