Cheap bits for cheap cuts. Incredibly blunt pieces that tore apart multiple pieces and timbers. On the 2" bit, both cutting surfaces broke off after the first use. The Teflon coating wears off after 6 or 7 passes. On the 3" nozzle, the chip wasn't much better on the first pass, but the coating stayed. Very poor quality product, buy 1 good American bat for about the same price as these 2 terrible ones and save yourself a headache.