These DEWALT multi-material drill bits can be used in wood masonry and metal and are ideal when drilling near to corners and edges. The drill bits have a fully supported carbide head which gives faster drilling and a non slip shank which ensures maximum retention in chuck. They can be used in rotary or percussion drilling modes.This DEWALT Multi-Material Drill Bit has the following specifications:Diameter: 8.0mm.Overall Length: 200mm.Working Length: 170mm.PTDDEWDT6531QZ