Ford New Holland Stabilizer Chain Short Version
Also known as check chains
Minimum useable length 511 mm
Maximum useable length 574 mm
Check for the 2-chain links
The long one has 3-chain links
Suits:
3230, 3430, 3900, 3910, 3930
4000, 4100, 4600, 4110, 4610, 4630, 4830
5030
and many other models 
Replaces:
87554774, CFPND936B, 81813319