Replacement coupling pin with 1 in. collar includes locking spring. Rugged steel construction ensures lasting durability. Use with standard or arched scaffold frames. Serves as connector when stacking mason and arch scaffold frames. Tapered end allows for easy stacking. Weather resistant for lasting use. This pin is acceptable for both 1.69 in. and 1-5/8 in. tube OD frames. Meets OSHA standards for safety.