Specifically designed to handle the abuse that impact drivers dish out， the DeWalt DW2149 28-piece Screwdriving Bit Set consists of the most commonly used bits， made of a special steel that is designed to be ultra-durable. Each bit uses a black oxide process for greater wear resistance and strength. The tips in the DW2149 set can be used with impact tools rated for up to 2，000 in. lb. of torque. Comes in a tough case to keep it organized and easy to transport.