TOO Diamond Saw available in 10 sizes: 6mm (0.23"), 8mm (0.31"), 10mm (0.39"), 12mm (0.47"), 20mm (0.78"), 25mm (0.98"), 30mm (1.18"), 35mm (1.38"), 40mm (1.57"), and 50mm (1.97"). Constructed from high-strength carbon steel for durability. Includes adjustable hole saw drill guide with suction cup the guide length is adjustable, with a maximum board opening of 3-1/4", compatible with all listed hole saw sizes. Features movable ball bearings with two modes (3 or 4 bearing attachment) for flexible setup by flipping the board. These diamond drill bits are made from industrial-grade carbon steel and nickel-plated to resist corrosion. Coated with high-quality diamond material for smooth, high-precision cuts without chipped edges. For optimal performance, use reduced drill speeds, low drill pressure, and ample water lubrication to significantly extend bit life. Suitable for use on glass, marble, tile, ceramic, PVC, and similar materials. When drilling, continuously apply water to minimize heat, reduce drilling pressure, and improve lubrication, which helps prolong the life of the bit. Ergonomic design includes large clearance holes along the bit to allow cooling water to flow in and debris to exit easily, ensuring smooth operation. In case of clogging, a screwdriver can be used to clear debris from the hole saw.