Quick Release: Standard 1/4" hex shank can lock into quick-change chucks of impact drills and electric screwdrivers easily and securely, improving your work efficiency magnificently. High-Performance Materials: The glass hole cutter is made of high-quality iron alloy, which is very sturdy and durable. At the same time, the surface is nickel-plated, which has good rust resistance, corrosion resistance and prolonged service life The high-quality diamond drill bits with thicker diamond coating make the edge of the groove sharper, which can achieve smooth and high-precision cutting. Large chip holes on the side can remove waste, ensuring smooth and accurate punching Attention: Begin drilling approximately at a 45 ( between the hole saw and the working surface ) angle and only moderate pressure is good for the service life of the hole saw. Size: Diameter 1-3/4"(45mm); Hex shank 6.35mm.