I bought this set for a hobby. I have a 4.8V cordless screwdriver with a hex driver and these bits are quick and easy to change. My drilling is limited to thin wood, plastic and aluminum, sometimes thin mild steel. So far they have worked great and added versatility to my cordless screwdriver. The woman likes them too, as the screwdriver and bit combo is much less cumbersome for smaller jobs than a full-fledged corded or cordless drill.