This Over Running Coupler / PTO Overrun Clutch is built for standard 1-3/8" 6-spline PTO shafts and provides a dependable connection between your tractor and PTO-driven implements. The coupler is engineered from strong steel materials to handle tough workloads, delivering steady performance for various agricultural tasks. Ideal for use with rotary cutters and other equipment requiring smooth rotational output, it installs quickly and works seamlessly with most Category 1 tractors. A practical addition to your PTO setup that supports consistent equipment operation.