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Product parameters 1, Hexagon bar wrench: 1. 2. Positioning drill diameter: 1*8mm. 3. Hole saw depth: 48 mm-1.89 Inches. 4. Length of shank: 1* 220mm-8.66 Inches. 5. Hole saw diameter: 1*70 mm-2.76 Inches. 6. Hexagon Socket Head Cap Screw: 1*class 12.9. Notice 1. Opening hole material: Can not be used for marble, pebbles, and to avoid rebar in cement walls. 2. Please use it with an electric impact drill instead of an electric drill. Tip 1. When Locating drill loose. Please tighten bolt with a wrench. 2. When you can't drill down, pay attention to check out whether the residue is blocking the hole opener. Please go on opening the hole after the waste has been disposed of.