Unlike the picture, the SPD cleat covers have the rear corners cut out to accommodate the two back weight bearing points so they are not as protected as the front of the cleat. Even so, the covers seem to do a reasonable job. I've had the back points knocked off before, but not since using the cleat covers. Also helps to keep dirt and gravel out of the cleat and stays secure as long as you make sure it is well attached when you put it on.
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