🔧 Drill Like a Pro—Unleash Your Inner Craftsman! Designed for optimal performance with water cooling—no dry drilling! Diamond coating ensures sharp, smooth cuts without broken edges. Crafted from high-strength carbon steel with a rust-resistant nickel finish. Perfect for glass, tile, and ceramics—ideal for DIY enthusiasts and pros alike. 10 different diameters to tackle any project with ease. Diamond Coated for Precision 10 Sizes (6mm to 30mm) High Strength Carbon Steel The 10 PCS Hollow Core Drill Bit Set is a professional-grade tool designed for precision drilling in various materials, including glass, tile, and ceramics. With a range of sizes from 6mm to 30mm, this set is made from high-strength carbon steel and features a diamond coating for sharp, smooth cuts. Ideal for both DIY projects and professional use, it ensures durability and efficiency with proper water cooling during operation.