This is an original equipment manufacturer (OEM) washer, part number 3557983M1, specifically designed for Landini tractors and also compatible with a wide range of Massey Ferguson, Fendt, and McCormick agricultural machinery. It features an outer diameter of 22 mm, an inner diameter of 12.5 mm, and a thickness of 2.5 mm, with a weight of approximately 0.005 kg. This washer is essential for ensuring secure fastening and proper spacing in various critical applications within the machinery.