Features: Brand new and high quality This tile hole saw is made of steel. Thick corundum coating on the tips provides superior cutting strength for maximum drilling results. Each hole drill is processed with a smooth and precise finish that reduces cutting resistance and drilling pressure, increases sharpness, and enhances lubrication usage. Excellent for making clean and precise holes on glass or ceramic and significantly extends the lifespan of the drill bit. These ceramic drill bits combined with large opening holes facilitate the entry of cooling water and prevent chip leakage. Makes drilling process easier and more comfortable. Perfect for drilling glass, tile bottles, storage jars, glass fiber, porcelain, tile ceramic, glazed tiles, bricks, and stones. When debris gets stuck in the hole saw, you can use a small screwdriver to remove it. Specifications: Material: Steel Color: Silver Product type: 5 mm (0.2 in) / 6 mm (0.24 in) / 8 mm (0.31 in) / 10 mm (0.39 in) / 12 mm (0.47 in) Note: Allow 1-5 mm tolerance due to manual measurement. The color displayed in the photos may appear slightly different on your computer screen because monitors are not calibrated the same way. Packaging contains: 5 pieces diamond hole saw drill bits/set