Features: Diamond Cutting Wheels: The cutting wheels are made of high-quality diamonds. With high cutting efficiency, high durability, stable quality, etc. Durable: Diamond cutting disc is uniformly coated with diamond particles. The dimensions cutting disc is sharp and sturdy. Great Tool for: Suitable for most rotary and air tools. Perfect for cutting gemstones, glass, ceramics, and porcelain. Including: 40pcs diamond cutting wheel (1in/0.87in/0.7in/0.6in, each 10pcs), with 8pcs 0.12in mandrel and 2pcs screwdriver. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Material:Metal Size:as the picture shown