Bought this, lapped my rings and realized, I'd probably never use it again. For 1" rings only.
Comes with tool, instructions, lapping compound all in the original Sinclair International box. It's solid steel so its practically indestructable. What else can I say. Lap your rings and put it back up for sale on the board when you're done.
If you have rings to mount or that are mounted, you need to lap them otherwise they're probably not in alignment and that's BAD !
Go here for more info: http://www.sinclairintl.com/cgi-bin/category.cgi?category=search&item=08-1000&type=store