The black-finished aluminum Card-a-Link from Cardellini is a coupler with four sockets that permit joining of any two 5/8" pins, such as those frequently found on Cardellini products, either parallel or at a 90-degree angle. The pins lock into place with an optional 3/16" Allen wrench. Additionally, the Card-a-Link has male 3/8"-16 threads at each end to mount pins or knobs with 3/8"-16 female threads.