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Feature: 1.Great tools for DIY, craft work, jewelry making or silver smithing. These discs are super thin making them perfect for making slots and slits; 2.Ideal For Cutting: Gem stones, metal, glass, ceramics, porcelain, tiles, carbide, rocks.etc; 3.These discs are coated on both sides as well as around the edge; Specification: Size: Bar by 3 mm / 0.1 degrees (38 mm diameter length L / s. 1.5) Saw blade diameter of 20 mm / s. by 0.9" Packing: 10 * 2 * blade rod Features: high efficiency, high durability, stable quality Note: The rational use of this product, try not to use in the excellent metal. Use the process, please add water, moderate to reduce the friction temperature. 1.Because the computer display and light will have a slight color difference. Caution: When you use this drill bits, the material temperature will get very high, please add some water or coolant to avoid the material get smoke when using it. Package includes: 10 x Mini Diamond Saw Blade