Locking Pins with a quick release ball at the end. 5mm pins will sometimes fit 3/16" recievers, and will loosely fit 1/4" recievers - It is recommended that you use a part that specifically fits your...
The pin stop is used on the Optimist BlackGold mast to hold the boom from dropping too low. It can also be used on the boom to keep the vang in place. Optiparts Part # EX1337
