They sure seem like a piece of junk. After replacing 40 blades in my Steel City Planner I now have 2 broken blades. I actually broke the first one simply by pressing it against the drum. I blamed it on the fact that it might not have installed correctly. But now that I've used it (and one of these broke during a test run and then got pinged into the scheduler) I'm afraid these blades will hurt someone/me. This isn't the first time I've upgraded with new blades, but this is the first time I've seen blades snap in half so easily. I would advise against buying it. I'll find other blades and send them back.