Feature:1. Various Sizes: Comes with 6pcs saw disc in different size, which will satisfy your various working needs.2. Quick Cutting: Enables a maximum rotational speed up to 20000RPM, works with high efficiency and stability.3. Broad Utility: Suitable for soft materials such as wood, plastic, glass fibre, copper, aluminium and so on.4. Good Material: Forged with premium high speed steel material, very sturdy and durable for long term using.5. Easy to Install: Designed to have a light weight and a compact size, the cutting wheel is easy to install.Specification:Item Type: Saw DiscMaterial: High Speed SteelMaximum Speed: 20000RPMCentre Aperture: 6.35mm (1 or 4 inch)Outer Diameter: Approx. 22mm or 0.87in, 25mm or 0.98in, 32mm or 1.26in, 35mm or 1.38in, 44mm or 1.73in, 50mm or 1.97inConnecting Shank Diameter: Approx. 3mm or 0.12in.Package List:6 x Saw Disc1 x Connecting RodNote:It is not recommended to use this product on very hard or thick materials, and do a good job of safety protection when using it.