This is a genuine Claas part number 13042390, a precision-engineered washer designed for optimal performance and durability in Claas agricultural and construction machinery. It features an inner diameter of 10.5 mm, an outer diameter of 20 mm, and a thickness of 2 mm. This essential component ensures proper spacing and load distribution, contributing to the reliable operation of various Claas tractors, combine harvesters, and forage harvesters.