Olympic Loading Pin - Open Top StyleSimilar to the standard version, except the top is open to allow certain armlifting implements (with barrels or loops) to slide on and get secured with a lock pin (included). The lock pin can also act a loop for attaching a carabiner the standard way. These loading pins come in different heights to provide flexibility in user height, weight capacity and or user preference in lifting from the legs or from the arms. Having multiple pins allow you to