JRK offers a complete line of drill and excavator undercarriages in a variety of configurations. Our chains are offered in greased, sealed, and lubricated varieties. We have a range of grouser shoes; triple, double, single, heavy duty and extreme service with highest grade track hardware. Our sealed rollers are forged from alloy steel and through hardened. We offer both one piece induction hardened manganese and forged segmented sprockets. Additionally we have a complementary line of non-undercarriage parts which include rack adjuster kits, piston & liner kits, gasket kits, bearings, gears, and ground engaging tools.