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Kind of like a big lawnmower blade, they have a blunt edge, sqaured off, when new. I try to take as little material off as I can and get them uniform as possible. I just did mine last week, but because the field I was doing was so high and just grass and weeds, I made them sharp, no blunt edge, although, they will blunt up some the more I mow with it. I've always wondered why the square edge on all mower blades, must be for a better cut on grasses, like on lawns, square cut instead of a rip that splits the blade of grass or some darn thing like it. The inspection hole should line up with a nut whne you rotate the blades around, if it's like mine the bolts might be a left hand thread with nylon lined nuts to keep it tight, mine has the shoulder bolt that shears, with left hand thread, no slip clutch, it's a Rhino SE-6. When changing blades or other work, I carefully flip mine over, I have balanced it on it's side, braced it off, stood out of it's path if it were to fall and have tightened, removed blades by myself with pipe on the end of wrenches so I could reach and hold one and turn the other, really a 2 person job, makes it so much easier and safer, be it braced on it's side or upside down, which is a safer way to work on it. You can use timbers perpendicular to the mower deck and set it on them so you have clearance to get under it, never fool with one with a pto connected to the tractor, the thought of it makes me cringe. Same is true, if you chock it up with timbers, making sure the timbers cannot roll out if it sways, you can get under there and sharpen those blades easily with an angle grinder. I had to take the stumpjumper pan with the blades attached off mine, finally figured how to do that, so I could get to the gear box housing bolts, they were loose, tightened them up, something made a difference, no more heavy wobble when I first engage the pto, nice and smooth, either my blades balanced a little better or the loose bolts made a difference, it cut real nice, did 2 acres right after I was done servicing it.
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