DEWALT DWA2T20C 20-piece Impact Ready Screw Driving Set is part of the DEWALT Flex Torq line of power tool accessories. Flex Torq allows bits to flex up to 15 degrees which equals increased durability and reduced breakage for longer bit life. This set allows you to maximize you Impact ready system. It features a 10x Magnetic Screw Lock System for strong fastener retention and is preferred by professionals everywhere. The bits are placed directly in the impact driver; no run out and allows for access areas. It also minimizes drops and reduces wobbling. These bits are durable and jobsite tough.