These are serious tools! We produce feed and mineral boxes for cattle and raised beds from 4x4 vehicles, which we receive in surplus. We fasten everything together by driving oak pins into the holes drilled in the joists. The 4x9 foot model requires over 100 holes, the sooner they are drilled the better. I've tried different beats and these are the best. Note, however, that larger bits, say 3/4 inch or larger, will require a heavy duty drill to really use these bits. Get it right but the…