Feature: 1. Diameter is 4in and have 2 arbor size-16mm/0.63in \u0026 22mm/0.87in for you option. 2. This size can fit almost all the angle grinder in the market. 3. Made by premium steel which has the higher hardness and longer life. 4. Depend on the special thorn design,this grinding wheel is powerful and more efficient than other grinding wheels. 5. Can be used for wooden materials,grinding,carving and any other DIY wood works. Specification: Features: Diameter is 4in and have 2 arbor size-16mm/0.63in & 22mm/0.87in for you option. This size can fit almost all the angle grinder in the market. Made by premium steel which has the higher hardness and longer life. Depend on the special thorn design,this grinding wheel is powerful and more efficient than other grinding wheels. Can be used for wooden materials,grinding,carving and any other DIY wood works. Specifications: Material: steel Color: black; golden (optioanl) Arbor diameter: 16mm/0.63in; 22mm/0.87in (optional) Outer diameter: 100mm/4in Package weight: 150g/5.3ounce(16mm); 115g/4.1ounce(22mm) Package size: 125 * 125 * 30mm/4.9 * 4.9 * 1.2in Package List: 1 * Disc Package List: 1 * Disc