The DEWALT DD5157 IMPACT READY 7pc Titanium Nitride Coated Drill Bit Set is designed for Metal or Wood. These bits are ground from solid 1-piece design and is up to 5 times more durable than the current 2-piece conventional product. The patented web taper increases the rigidity of the bit to decrease the potential for bit breakage and the patented pilot point tip allows users to drill holes faster than the conventional split point product and offers clean burr free holes with reduced bit walking. Common users include electricians, HVAC, mechanics, glaziers and GC's. These drill bits feature a 1/4" Hex shank. Set includes: (2) 1/8" bit, (1) 5/32" bit, (1) 3/16" bit, (1) 7/32" bit, (1) 1/4" bit, (1) 5/16" bit.