These plastic washers are good for keeping you rack units free of scratches. They are good quality and do not break easily. Unfortunately, they are a little too big and may stick out over the edge of the rack unit, if placed too close to it. But this is only a problem when placing 1U units next to each other, and it is not too difficult to plan around it.
These plastic washers keep my equipment free from scratches while mounting in the rack and do the job well. The only negative thing that I found is that these washers are slightly bigger than the ones I used to use so sometimes they overlap outside of the rack unit. Other than that it is a good product
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