Feature: 1. Hole Drilling: No watering required during drilling, and the hole also ensures neat and smooth cut edge without burrs. 2. Better Design: M14 thread design enables high torsion and bearing, not easy to slip, works with stability and safety. 3. Practical Use: Allows for application in cutting holes on marble, glass, ceramic tile, granite and so on, very useful. 4. 6Pcs in Total: There are 6pcs hole drill bit with 22mm, 35mm, 38mm, 40mm, 50mm, and 68mm diameter for your work needs. 5. Good Material: Comes with even and thickened diamond coating, rustproof, and very durable with wearing and long using. Specification: Item Type: Diamond Hole Saw Material: Diamond Colour: Black Aperture: Approx. 22mm / 0.87in, 35mm / 1.38in, 38mm / 1.5in, 40mm / 1.57in, 50mm / 1.97in, 68mm / 2.68in Head Height: Approx. 15mm / 0.59in Working Length: Approx. 40mm / 1.57in Overall Length: Approx. 60mm / 2.36in Female Thread: M14 Scope of Application: For marble, glass, ceramic tile, granite and other stone openings. . Package List: 6 x Diamond Hole Saw1 x Aluminium Box1 x User Manual Note: 1. Do not use these drills with hammer mode.2. Only mount these bits on corded drills rather than cordless drills since the power is not enough.3. Only for tile drilling, 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 drill bits are used to enlarge, reshape or round the bevel of existing holes.