This DEWALT Impact Titanium Drill Bit is designed for use in any make of impact driver with a 1/4" hex chuck, offering high performance and faster drilling. Its unique tip design eliminates walking and increases drilling speed. Specifications: Size: 12.0mm. Overall Length: 102mm. Working Length: 50mm. This bit is the new version, titanium coated. It is supplied loose, having been taken from a set. DEWALT DT50018-QZ Impact Titanium Drill Bit 12.0mm OL:102mm WL:50mm.