So far I've used them on 3/4" Baltic Birch plywood and 1/2" HDPE plastic. This left a smooth finish on both. HDPE performed best at around 10,000 rpm. There was no recoil or vibration (other than the bearing in my router starting to fail). The bearings had no snags and rotated smoothly in patterns. I didn't rate durability as I haven't had it long. I've run less than 20 feet of material through them while working with small pieces. I recommend.
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