High Quality MaterialsThe hole saw kit is made of high quality bimetal. The main body is made of a special flexible steel and the teeth that cut the material are made of HSS. The bi-metal hole saw drill bit with sharp tooth shape, durability and good stability. Precise & Clean CuttingNon-binding sharp edge design and duplex teeth ensure cleaner and smoother cutting with higher precision. Chip evacuation holes allow quick disposal of cutting waste. Superior PerformanceVarious and fine toothing ensures that the hole saw does not get stuck in the material and operates smoothly. Bi-metal hole saws have a greater number of cutting edges than carbide hole saws, resulting in a clean cut. Wide ApplicationThe bi-metal hole saw is designed for drilling holes in sheet metal, wood, plastic, pipe, PVC and fiberboard. It is your ideal choice for DIY projects and home maintenance and repair. Buy with ConfidenceWe offer a "TWO YEAR" warranty on hole saws. If you have any questions, please feel free to contact us, we will do our best to solve them for you. (Please clamp the shaft in the right place and take the necessary protective measures in the wood processing.) Bi-metal hole saw - Perfect for installing locks, knobs in doors and cabinets or drilling larger holes diameter across desks etc. - Designed for drilling sheet metal, drywall, plastic pipe, wood, PVC and fiberboard holes. - Metal double hole with M42 carbon steel and bimetal, sharp and