This is a genuine Claas 2122210 retaining ring, designed for secure fastening within various Claas machinery. Confirmed as an original equipment manufacturer (OEM) part, it features an inner diameter of 40 mm, an outer diameter of 47 mm, and a thickness of 4 mm. This essential component is compatible with a wide range of Claas LEXION, JAGUAR, AXION, ARION, and XERION series machines, ensuring reliable performance and proper fitment in critical applications.