Faster and smoother machining due to a novel tooth design with irregular tooth shape and spacing; this also results in less vibration. Optimized for use in steel and gray cast iron, stainless steel, structural steel, aluminum, bronze, copper, PVC, acrylic glass, and wood. Maximum cutting depth approximately 35 mm. Thread for hole saws with a diameter of 14-30 mm: 1/2"-20 UNF; thread for hole saws with a diameter of 32-152 mm: 5/8"-18 UNF. Use hole saws only with the corresponding adapter shank and center drill.