The Stud for 3 & 4-Way Clamp is designed to attach to any of the mounting locations on Kupo's 3-Way Clamp (KG900412) or 4-Way Clamp (KG900712) to accept any light fixture or accessory with a baby 5/8-inch receiver. The proprietary notch slides into one of the mounting locations and is secured by turning the locking collar.