10 Pack 1/4″ X 3″ Square Shaft Locking Pin, Heavy Duty Safety Coupler Pin for Tr

If you’ve ever had a coupler pin pop out mid-haul or rust after just one season, you know the frustration. We’ve also deburred every edge: no burrs, no paint scratches. The 5.93mm thickened shaft resists bending or shearing, giving you peace of mind when towing heavy loads.