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Description:* This glass hole saw needs to be used at a low speed, about 800-1000RPM.* Please start your hole diagonally, make a round trace and then hold drill straight.* In order to prolong the life of this glass hole saw, please work with coolant when processing.* Wide used for drilling glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone and fiberglass. Specification:* Material: Carbon Steel, Diamond Particles* Color: Silver Tone* Drilling Diameter: 30mm / 1.18-inch* Drilling Depth: 31mm / 1.22-inch* Shank Diameter: 7mm / 0.28-inch* Total Length: 51mm / 2.01-inch Package Content:* 5 x Glass Hole Saw