The brazed dry diamond core hole saw kit is made of Carbide, making it strong and durable. The surface adopts high anti-corrosion brazing process, and the top is thickened with diamond coating to provide excellent cutting strength, achieve high-precision and smooth cutting, and drill stably and quickly. Widely used, our brazed dry diamond drill bits can not only be used for daily tile drilling, we also come with several smaller size drill bits designed to provide customers with daily home gardening DIY needs, perfect for drilling holes in ceramic vases , providing a better environment for plant survival. Your Perfect choice - Our tile hole saw kit can meet most drilling needs in your work or daily life. Suitable for most brittle and hard materials such as ceramic tiles, ceramics, glass (except tempered glass), marble, granite, terrazzo, etc. Ergonomic Design - All brazed hole saws are treated with a special high temperature resistant process. Even without water as a lubricant, they can still withstand the intense heat generated by the hole saw spinning at high speeds. Of course, you can also use water as additional coolant to extend the life of your hole saw. MULTIPLE SIZES - 8 piece professional brazed dry diamond hole saw including 6mm (1/4inch), 8mm (5/16inch), 10mm (3/8inch), 14mm (9/16inch) , 18mm (3/4inch)), 20mm (7/9inch), 25mm (1inch), 30mm (1-1/5inch). These diamond hole saw drill bit kits contain different sizes of diamond drill bits to meet your unique drilling needs and improve your productivity. Colour:gold Material:Carbide Package Contents: 8 x Dry/Wet Brazing Tile Core Drill Bits Sets Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.