The bi-metal hole saw material is heat-treated bi-metal M42 saw band with sharp teeth, durable and good stability. Processing materials range from thin metal to wood, plastic, PVC, etc. A hole saw requires only 1 pass to cut dowels; these hole saws are ideal for jobs where high performance and precision are required. Excellent for cutting wood, plastic, machinable metal, nail-embedded wood, plywood, pipe and steel. High-speed steel hole saws offer impact-resistant teeth and resist dental scratches. Soft spring steel creates a flexible backing material that allows the hole saw to absorb the impacts of drilling work in difficult-to-cut materials. Cuts faster, smoother, without as much less vibration than others thanks to its variable-pitch teeth; creates holes for the installation of pipes and tubes, door lock installations, electrical conduit, pipes and antennas. Teeth are electron welded for an unbreakable and shock absorbing alloy body. Packed in individual boxes. Note: the gazebo is