This adjustment washer is a clutch component used to set the axial clearance between the clutch pack and the pressure plate. It sits between the clutch hub and the release bearing assembly, where its thickness determines the free play that allows the clutch to disengage fully. A washer of incorrect thickness causes either clutch drag or premature release-bearing contact. This part is machined to the original thickness specification so that no shimming or stacking is required during installation. When replacing the clutch, measure the clearance and select the washer that restores the specified gap.