Versatile Drill Bit Set: Includes 10 drill bits (6mm, 8mm, 10mm, 12mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm) to tackle any project. Premium Quality: Diamond drill bits are finely machined for durability, offering chip-free performance, high speed, sharpness, and wear resistance. Adjustable Hole Saw Guide: Protect your tiles from scratches with our adjustable hole saw guide featuring suction cups, suitable for all hole saw sizes up to 3-1/4" diameter. Anti-Slip Design: Triangular shank ensures a secure grip, preventing slippage. The robust carbide tip with a pointed design easily penetrates various materials like tile, concrete, brick, glass, plastic, and wood. Unique Design: Large through-hole facilitates easy entry of cooling water and allows chips and particles to escape, ensuring smooth punching and simplifying the drilling process. Easily remove debris with a screwdriver if needed. Wide Application: Ideal for glass, marble, tile, ceramics, wood, and more. Use with water to reduce drilling speed and pressure, significantly extending the bit's lifespan. Not suitable for concrete deeper than 1/2 inch.