HARFINGTON 10pcs 120-140 Grits Diamond Grinding Bit 2.5mm Cylinder Head 2.35mm Shank 10mm Length Stone Sanding Drill Bits Rotary Tool for Stone Ceramic Glass Grinding, Polishing

["Size - Grits: 120-140 Grits; Diameter: 2.5mm / 0.1\"; Head Length: 10mm / 0.39\"; Shank Diameter: 2.35mm / 3/32\"; Shank Length: 35mm / 1.38\"; Total Length: 45mm / 1.8\"; The multi-purpose tool diamond drill bit set is packaged in a sturdy plastic box for your convenience to carry and store","Material - This grinding bit is made of stainless steel, which has excellent heat and corrosion resistance, and is covered with a sharply diamond particle coating that will not fall off or deform due to repeated use","Features - The round handle design of the rotary tool diamond grinding drill bit makes it suitable for most electronic grinders, engraving machines, hanging grinders and hand drills, which is very suitable for gemstone carving, molding repair, casting cleaning, rust removal and polishing, and DIY enthusiasts","Applications - The diamond drill bit set is very suitable for home decoration and handicrafts. It is a good helper for polishing, grinding, drilling, cutting, engraving and other operations, which can be engraved on various materials, such as tiles, ceramics, marble, stone, ceramics, agate, and even hard metals such as iron and silver","Notice - Wear appropriate protective equipment when using to protect your eyes; the operating speed is kept between 30000~50000RPM. Exceeding the maximum speed may cause the drill bit to jump, reduce the grinding effect, and even cause the rod to bend in severe cases"]