Welcome to the store! 1. Superior Drilling Performance: Industrial-grade carbon steel with a nickel-plated coating resists corrosion. The thickened diamond coating provides excellent cutting strength, high precision, and smooth cuts for optimal drilling. 2. 10 Different Drill Bits: This set comes equipped with 10 different drill bits to meet a variety of needs. 3. Practical Large and Small Holes: A large opening hole facilitates the entry of cooling water, preventing chips and particles from escaping, ensuring smooth punching and easier drilling. A small hole is convenient for pulling out debris when stuck. With detachable ball bearing, suitable for hole saws of various sizes. 4. Versatile Material Removal: Can be used to remove glass, marble, tile, ceramics, PVC, or other materials. Item Type: Hollow Drill Hole Saw Set Material: ABS+Carbon Steel Purpose: Hollow Drilling 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 Screwdriver Length: Approx. 12.6cm / 5in 1 x Hole Saw Guide 10 x Hole Saw Bit 1 x Screwdriver 1 x User Manual Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!