The dewalt dt71501 56 piece drilling screwdriving set is ideal for wood drilling metal drilling and screwdriving applications it comes in a medium size tough case for convenient storage and portability of the high quality professional screwdriver bits these are designed with a flexible torsion zone to absorb torque peaks and reduce breakage the flatwood drill bits have a ground central point and a ground chip breaker for clean accurate cutting and improved drilling efficiency with reduced wood