The OFA Eko tractor chains are manufactured from boron steel and hardened in the same specialized process as our forestry chains.

The EKO 9 is made with 9 mm twisted chain links with two 10 mm studs on each link. Ideal for most larger sizes of farm tractor tires. For smaller tire sizes, OFA makes the EKO 8 using 8 mm twisted links with two 9 mm studs on each link.