If you are looking for a durable bit set that can withstand the demands of your power tools, then look no further than the Irwin IWAF1234 Bit Set. It is suitable for use with power tools. The carbon steel bit set has 1/4" hex shank sizes. This 34-piece bit set contains all of the most commonly used fastening tool items in one package. Irwins' IWAF1234 Bit Set will give you peace of mind knowing that you have all of the right bits at hand to get any job done.