Same as the spade bit set I got from Irwin. At such a good price I wanted to try it and was not disappointed. The bit has a great positive lock on the hole saw with dual pins that thread through the hole saw. Hole saws are very durable and I like being able to quickly change without having to remove the bit from the drill, just flip the locking pins, unscrew one hole saw from the drill and screw the other back on. Everything comes in a nice zipped carry case to keep everything together whether hanging on the wall or carrying to where you need it. I highly recommend this product.