These were just the anti-vibe humps, not the shark fin safety ones
. I grind those off myself, I think I'm down to about 1/2 a 5 gallon bucket of home-depot safety chains now lol. I have a pretty good system on them now and they actually cut very well, self feed, and will bore when I get finished with them, unfortunately it takes around a half hr to get one set up.
The bummer about the 20" chain I did is that because of the anti-vibe humps, I can't toss the chain on the raker grinder as it doesn't take those down at all. When the chains are on the raker grinder they are fully open as they go around the wheel
. At least the others I did were tossed on there and the raker grinder was working while I was
.