Dewalt multi material drill bits 80 160mm dewalt dt6517 qz this 4 x 103mm drill bit from dewalt has been manufactured to a very high standard courtesy of the fully supported carbide head which gives faster drilling and a non slip shank ensuring maximum retention in chuck whether you are a professional tradesman or diy enthusiast you can use the bit when drilling near to the corners and edges of wood masonry and metal dewalt dt6517 qz multi material drill bit 4mm x 103mm