Feature: 1. RELIABLE DRILLING: Adjustable drill guide with suction cup suits for hole saws of all sizes, so there is no need to worry about scratches. 2. DIAMOND DRILL BIT: Through exquisite workmanship, the drill bit is incisive and wear resistant, not easy to have tipping in fast speed. 3. TRIANGLE SHANK: The triangular shank can hold the drill bit firmly and prevent slipping, ensuring high working stability and efficiency. 4. CLEARANCE HOLE: Large clearance hole will facilitate the entry of water and the escape of chips and other particles, easy and practical. 5. WIDE APPLICATION: Allows for flexible application on various materials, such as glass, tile, marble, ceramic, wood and other materials. Specification: Item Type: Diamond Drill Bit Material: ABS + Carbon Steel Function: Diamond Drill Bit Hole Saw Drill Bit Diameter: Approx. 6mm / 0.2in, 8mm / 0.3in, 10mm / 0.4in, 12mm / 0.5in, 20mm / 0.8in, 25mm / 1in, 30mm / 1.2in, 35mm / 1.4in, 40mm / 1.6in, 50mm / 2in Triangle Drill Bit Shank Size: Approx. 8mm / 0.3in, 6mm / 0.2in, 5mm / 0.2in Screwdriver Length: Approx. 12.6cm / 5in. Package List: 1 x Hold Saw Guide Clamp10 x Hole Saw Drill Bit4 x Triangle Drill Bit1 x Screwdriver1 x User Manual Note: When the diamond bit is working, please keep adding water to reduce the drilling speed and pressure, which greatly prolongs the service life of the bit.