Due to the difference of measurement tools, there may be an error of 1-3cm in the product size, please understand, thank you! SPECIFICATION: Name: water injection type pneumatic water mill Model: SK-1880 Table size: 3 inch or 4 inch Speed: 4500RPM Air consumption: 6CFM Flange diameter: 16MM Package size: 25*17*10CM Weight: 2.8KG Use: marble, granite, artificial stone stone grinding and polishing work