The John Deere AZ54820 is a genuine OEM Stationary Knife Adjustment Spring Kit designed for precise adjustment of stationary knives in John Deere combines and cotton harvesters. This essential kit ensures optimal performance and longevity of the cutting system. It is compatible with various models including C670, S660, S670, S670HM, S680, S680HM, S690, S690HM, S760, S770, S780, S785, S790 Combines, and CP690, CS690 Cotton Harvesters. Weighing approximately 0.12 kg, with dimensions of 95 mm length, 51 mm width, and 51 mm height, this kit provides the necessary components for reliable knife adjustment.