The strength and durability of heat-treated screw- and nut-driver bits make them a great choice for the demanding professional, and that dependability is exactly what you get in the DeWalt DW2163 37-Piece Set. 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 heavy-duty case made from industrial-grade material, so you never end up sorting through the bottom of a big tool kit for a little bit tip. A sliding rubber lock keeps this kit closed during transport for peace of mind. Included with this kit is a Compact Magnetic Drive Guide, 5/16-inch by 1-7/8-inch magnetic nut driver, 1/4-inch by 1-7/8-inch magnetic nut driver, no.2 Phillips 3-1/2-inch power bit, no.2 square recess 3-1/2-inch power bit, no.2 Phillips/no.8 slotted double-ended bit, no.1 Phillips 1-inch insert bit tip, ten no.2 Phillips 1-inch insert bit tips, no.3 Phillips 1-inch insert bit tip, a no.6 slotted 1-inch insert bit tip, no.8 slotted 1-inch insert bit tip, no.10 slotted 1-inch insert bit tip, no.1 square recess 1-inch bit tip, six no.2 square recess 1-inch bit tips, and a no.3 square recess 1-inch bit tip.