Feature: 1. High Performance: The opening is neat, smooth, no broken edges, no need to add water, incisive and wear resistant, and can drill deep holes stably. 2. M14 Female Thread: M14 screw design, handle to prevent slipping, large torsion, high bearing capacity, suitable for marble, glass, ceramic tile. 3. With Portable Case: The entire accessories are kept in an aluminum box to prevent the accessories from rusting and corroding, and the appearance is smooth and high end. 4. Emery Coating: Thickened emery coating is used, and the coating is uniform, which improves the wear resistance and service life of the hole opener. 5. Robust and Durable Material: The cutting blade of the diamond hole saw is made of high quality diamond, which provides more efficient performance than traditional carbide or bi metal hole saws. Specification: Item Type: Diamond Hole Saw Material: Diamond Color: Black Product Hole Diameter: Approx.5mm / 0.20in, 6mm / 0.24in, 8mm / 0.31in, 10mm / 0.39in, 12mm / 0.47in, 20mm / 0.79in, 32mm / 1.26in, 35mm / 1.38in, 68mm / 2.68in Emery Width: Approx.15mm / 0.59in Working Length: Approx.40mm / 1.57in Overall Length: Approx.60mm / 2.36in Female Thread: M14 Application: Marble, glass, ceramic tile, granite and other stone openings. Package List: 9 x Diamond Hole Saw1 x Aluminum Box1 x User Manual Note: 1. Do not use these drills with hammers.2. Only mount these bits on corded drills, not cordless drills (which don't have enough power).3. For tile drilling only, not recommended for materials behind tiles.4. For horizontal drilling, just apply light pressure.5. For vertical drilling, the weight of the machine will provide enough pressure.6. Finger drills are used to enlarge, reshape or round the bevel of existing holes.7. Wear all applicable safety gear when using these diamond bits.