This is a shim for John Deere B tractor eccentric bushings. The purpose of this shim is to reduce the up and down movement of the steering pedestal shaft. Usually 3 of these shims are stacked under the tractor eccentric bushing. See the John Deere B service manual for proper set up using these shims. See also in KITS our GP-24H813PK for a full set and extra savings.