Quality Selection: These diamond drill bits are made of high-quality 45 steel, offering durability and strength. The nickel-plated body resists corrosion for extended service life. Large chip holes allow for smooth and accurate drilling performance.Smoothly Cutting: A thick diamond dust coating on the tip provides superior cutting strength, delivering high precision and clean, smooth cuts without chipping or broken edges. For best results, use reduced drill speeds, low drill pressure, and ample water lubrication to significantly extend the life of the bit.Multiple Applications: This diamond drill bit is designed to cut clean 130mm diameter holes in glass, ceramic, tiles, porcelain, marble, light stone, fiberglass, bottles, jars, and blocks. Not suitable for concrete or drilling depths exceeding approximately 1/2 inch.Specifications: - Coating: Nickel-plated - Color: Silver - Material: Diamond-coated 45 steel - Size: 130mm Package Contents: 1 x Diamond Drill Bit How to Use: 1. Secure the drill bit into the drill. 2. This hole saw does not have a centering point; begin at a 45-degree angle slowly to start the cut. 3. First, create a small guide mark to locate the center, then continue drilling vertically. 4. Maintain a controlled speed—do not drill too fast—and always use water as a coolant during operation.Attention: 1. Always use water lubrication when operating the diamond drill bit to prevent overheating and damage. 2. Do not use on metal materials. 3. Not intended for use on concrete or for depths greater than approximately 1/2 inch. 4. Maintain a speed of 800–1000 RPM, apply low drilling pressure, and use sufficient water to maximize bit longevity.Package includes only the items listed above. Other accessories are not included.Note: Slight color variations may occur due to lighting and monitor display differences. Measurement error is +/- 1–3 cm.