This is a fully case hardened, ground shaft for tappet lever assemblies on John Deere model B and 50 tractors. Included are two stainless steel cotter pins. We sell a number of parts for the tappet lever assembly on these tractors. See our total rebuild kits in our KITS category. The part numbers are GP-TLPKB/50 and GP-TLPKB/USB.