This 4" air angle grinder is a versatile tool that can cut, polish, and sand surfaces with ease. It has a working pressure of 0.8mpa and a no-load speed of 11000rpm, making it a powerful grinding machine. The grinding wheel size is 4 inches (100mm), and the wheel diameter is also 4 inches. This pneumatic grinding tool has an air tube inner diameter of 3/8' and an air consumption of 6scfm. It is a standard action tool that can be used for various applications. The intake thread is 1/4', and it is made in China. This Infinity brand air grinder is perfect for home and workshop use, and it is an excellent addition to any tool collection.