S Type Agriculture Tractor chain 1. 40Mn, 45Mn quality alloy steel 2. carbonized harden 3. competitive price S Type Agriculture Tractor chain1)Model ... numbers:S type agriclutural chain: S32, S42, S52, S52L, S55, ... carbon steel,nickel-plated,zinc plated,copper platedSPECIFICATION:PACKING: S Type Agriculture Tractor chain