Features Excellent Performance: No watering required during drilling, and the hole also ensures neat and smooth cut edge without burrs. M14 Thread Design: The diamond hole saw drill bit opener has M14 thread design which enables high torsion and bearing, not easy to slip, works with stability and safety. Wide Application: The diamond core drill bits set allows for application in cutting holes on marble, glass, ceramic tile, granite and so on, very useful. 8Pcs in Total: Has 8pcs hole drill bit with 20mm, 25mm, 32mm, 35mm, 40mm, 50mm, 60mm and 68mm diameter for your needs. Thickened Diamond Coating: The diamond hole saw set 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: Green Aperture: Approx. 20mm / 0.79in, 25mm / 0.98in, 32mm / 1.26in, 35mm / 1.38in, 40mm / 1.57in, 50mm / 1.97in, 60mm / 2.36in, 68mm / 2.68in Sand Band Width: Approx. 15mm / 0.59in Total Length: Approx. 50mm / 1.97in Female Thread: M14 Scope of Application: For marble, glass, ceramic tile, granite and other stone openings.  Package List: 1 x 20mm Diamond Hole Saw 1 x 25mm Diamond Hole Saw 1 x 32mm Diamond Hole Saw 1 x 35mm Diamond Hole Saw 1 x 40mm Diamond Hole Saw 1 x 50mm Diamond Hole Saw 1 x 60mm Diamond Hole Saw 1 x 68mm Diamond Hole Saw 1 x Aluminium Box 1 x User Manual Note: 1. Do not use these drills with hammer. 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. 7. Wear all applicable safety gear when using these diamond bits. Package List 1 x 20mm Diamond Hole Saw 1 x 25mm Diamond Hole Saw 1 x 32mm Diamond Hole Saw 1 x 35mm Diamond Hole Saw 1 x 40mm Diamond Hole Saw 1 x 50mm Diamond Hole Saw 1 x 60mm Diamond Hole Saw 1 x 68mm Diamond Hole Saw 1 x Aluminium Box 1 x User Manual