This durable engineering quality HSS ground drill is designed for drilling sheet metal and wood with a 1/4 hex chuck impact driver. The quick change shank can be rapidly interchanged for easy and hassle free drilling. Diameter mm: 8.0 Working Length mm: 75 Total Length mm: 117 Shank Dia. inch: 1/4 Timco Impact Drill Bit (Size 8.0mm - 1 Each) in Black