The strength and durability of heat-treated screw and nutdriver bits make them a great choice for the demanding professional, and that dependability is exactly what you get in the DEWALT Screwdriving Bit Sets. The advanced hardening process used in the creation of these tools allows them to provide higher torque and improved driving power, so you get jobs done faster and more efficiently. And they come neatly packaged in a case, so you never end up sorting through the bottom of a big tool kit for a little bit tip.