Does anyone know what the "usable" length is?

They are designed to be have 2" clear between the head of the bolt and the wire retainer when the retainer is in its natural position. The claims that 2 3/8" are usable should be qualified with warnings that the retainers will be sprung or stretched outward, and perhaps prone to popping open. The intended use is for 2" or less diameter tubing.

does this work as a pin to hold extender in place??

these pins are not meant to have any real force on them

How do you open and close it?

Just pull the bracket end that is open (not attached to the pin) out just far enough to clear the pin and pull it to any side. Put the pin in the item you want and again just pull the bracket out far enough to clear the pin and place the open end of the bracket over the pin. It will spring back to its origiinal shape.

What is the sheer rating for this pin?

There is none since all it is meant to do is to hold the coupler down onto the ball. There is no stress on it.

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🔒 Secure Your Adventure with Confidence!

HIGH STRENGTH - Solid steel construction for reliable safety.
VERSATILE FIT - Compatible with various trailer couplers and jacks.
SECURE ENGAGEMENT - Ensures your trailer stays hitched with confidence.
CORROSION RESISTANCE - Zinc finish for long-lasting durability.
USER FRIENDLY DESIGN - Spring steel clip for effortless operation.

The CURT 25080 Trailer Coupler Pin is a robust and versatile solution designed for a variety of trailer couplers. With a 1/4-inch diameter and 2-3/4-inch length, this pin ensures secure engagement and is made from high-strength carbon steel with a corrosion-resistant zinc-plated finish, making it perfect for all your towing needs.