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, S55VH, S62, S77, S88Attachment: K1, WK1, F1, F3, SD, K39M, C6E, C11E, CPE2)Colors available:natural,yellow,blue,gold,black3)Materials:carbon steel,nickel-plated,zinc plated,copper ...