I left about 120ft of 1x6 pine to make a baseboard out of and they gnawed it through like nothing happened (even if I accidentally cut a few full tread pieces on the first pass - not recommended). It still cut through wood like a hot knife through butter. The sound seemed a lot louder than the other beats until I realized my mistake! However, multiple passes are recommended (about 1/8 inch to gradually get the full profile of the bit) otherwise it can be difficult to keep the material from moving up and down/back and forth without good feather boards move. /guides to keep it in place. Otherwise I'm pretty sure the life of the blades on the bits will be significantly reduced and you'll need to sharpen them much sooner than with normal use. Due to the easy wear of the blades, trying to cut too much material out of the shaft can damage the wood or your router. I was lucky it was after the first two runs with a new attachment and very sharp blades! Very strong, heavy bits. A 1/2" shank is what you want if you have to traverse a lot of linear feet (at least for reassurance, it was worth the extra money for me). Great product and experience so far.
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