Valve grinding stone's that is. I needed a small set for hardened valve seat inserts in several Farmall Cub blocks that we have laying around in the shop. One is a 45* and the other is a 30*. I'll add a 60* to the backside of one of the stones if these stones are like the others we have.
Finally made sure the new stone's fit our valve grinding setup. Looks good, but these stones are so small that they can't be reversed on the holder in order to cut a 60* angle on the backside. I'll just have to order another small stone for the 60-degree grind. I'll check a couple other engines to see if I need other sizes also.
I got them to do the hardened seats in some Farmall cub engines, but they will fit a lot of the small air cooled engines also. These are specifically made to work on hardened seat inserts.
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