Upfit the Supertrak SK170RR excavator with this heavy-duty hydraulic-powered SK10RR undercutter. This 10-foot bar is designed to quickly remove mud and fouled ballast from beneath the track with its replaceable teeth.The chain offers a variable controlled reverse for easy cleanout, and there is also a direct coupler mounted to use with or without a rotator option. When machine is equipped with Rototilt option, it spins 360 degrees. The undercutter bar fits 8 ton to 15 ton class machines.