Dewalt dt71540 brushless screwdriver bit set 53 piece with safety glasses the dewalt dt71540 is an impact bit set suited to impact screwdrivers and drill drivers alike with all the common sizes and a pair of dewalt safety glasses this is a perfect starter set for the professional trades robust small tough case for safe storage and easy accessibility to screwdriving accessories the bits feature a a hex shank design with a heat treated body and an optimised tip design giving increased strength lif