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.The DEWALT DEWDT6517QZ multi material drill bit has the following dimensions:Size: 4mm x 103mm. Multi Material Drill Bit 4.0mm OL:103mm WL:73mm