Using this product our team found that the drill bits performed with incredible accuracy. They easily carved through various types of wood and maintained their sharpness through repeated use. The industrial and scientific quality of these drill bits ensured that our woodworking projects were completed with a professional finish. The only con we found was that occasional clogging of the drill bit required frequent cleaning, but this was a minor inconvenience for the quality of work produced .Overall, we highly recommend these drill bits for anyone in need of reliable and precise cutting tools..