I know the top of it is a slide hammer or bearing tool, a Proto 4056, but I can't find anything like the bottom of it. Solid metal and about a foot long, no markings I can find on that part. Looked at a lot of kits and parts in various eBay and other posts but came up empty. Maybe it's just so old and obsolete there's no pictures online. That's a standard card table the tool sits on, to give an idea on length. My thought was maybe some kind of tool for rear axle bearings but I can't figure the length on it.