Feature 1Higher Efficiency: Using internal, medium and external three flute design, bring higher efficiency, not easy to collapse 2For Various Materials: Hole saw drill bit can be used for cutting marble, ceramic tiles, wall stone, floor tiles, thick iron plate and other metal, etc. 3Reduce Opening Resistance: The cut out design is larger, which reduces the resistance when opening the hole greatly, more smooth cutting 4Fast Speed: Drill bit provide fast drilling speed, round hole without gap, provide high working efficiency 5High Speed Steel Material: Adopt good quality high speed steel material, possess corrosion resistance, good mechanical properties, and high strength Item Type: Hole Saw Drill BitMaterial: High speed steelCutting Diameter: Approx. 22mm / 0.87in Package List 1 x Hole Saw Drill Bit1 x Hex Wrench1 x Spring Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia