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: 10.0 Working Length mm: 87 Total Length mm: 133 Shank Dia. inch: 1/4 Timco Impact Drill Bit (Size 10.0mm - 1 Each) in Grey