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About the itemAbout the size: a wide range of sizes are available. Sizes are in metric system. Standard sizes for precise openings. Please check the size to fit the project before purchasing the opener.Advantages of the hole cutter: The hole saw is made of high quality carbon steel. The opening end is diamond coated and electroplated and cured to help increase drilling speed. Longer life, high hardness, good wear resistance and sharpness.Tips for use: water needs to be added when drilling to avoid damaging the drilling material and wearing out the hole saw and to prolong the life of the hole saw.