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*Package Included: 2 x Diamond Hole Saw Set with hole diameter: 1-3/8” / 35mm, total length: 2” / 50mm.*Quality Preferred: The diamond hole cutter is made of industrial-grade carbon steel and plated with a nickel coating to enhance the corrosion resistance. The high quality diamond coating improves the hardness, sharpness and cutting speed of the drill bit and realizes a smooth, high precision cutting edge without damage.*How to use: During operation, please keep adding water to keep the hole saw cool and increase lubricity. Keep the drilling speed at 800-1000 per minute to reduce the drilling pressure, which can greatly extend the service life of the hole saw. (Please note that: dry drilling is strictly prohibited for this product.)*Widely Used: The glass hole saw suitable for Glass, Tile, Fiberglass, Porcelain Tile, Ceramic, Slate Mable, Granite Light Stone. Not for use on Concrete.