These T bits work well. So far I've only used the larger of the two in the set. They're lightweight, so I'd be afraid to make a full cut in hardwood without first going through the work piece with a skirting board to get rid of most of the waste. I did this. First I fed the hardwood material through a stack of slots matched to the width of the router shank to remove most of the scrap so that after I fed it through the T-bit the router only had to remove the inside . Percentage of waste in "T". So far, so good.
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