【HIGH-QUALITY MATERIAL】Hole Saw Set is made of high quality Bi-Metal. The main body and the cutting edges of the bi-metal hole saw consist of two different tool steels (bi-metal). The main body consists of a special flexible steel and the teeth that cut the material are made of HSS.【SUPERIOR PERFORMANCE】The varied and fine toothing ensure that the hole saw does not get caught in the material and runs smoothly. Bi-metal hole saws have a larger number of cutting edges than carbide hole saws, which allow a clean cut.【WIDELY AND PROFESSIONEL USE】It is your ideal choice for DIY projects and household maintenance and repair. Suitable for metal, normal wood, thin PVC board, plastic.【FAST & SMOOTH CUTTING】The sharp tooth edge design makes the cutting smooth and fast. The spring on the drill is very good because it automatically pushes the disc out of the saw after completing the hole.【TOOL CASE SET】A set of tool cases convenient for carrying around. Large size and ample capacity. This is a tool case with excellent usability.