The Leofoto DC-364C Center Column for 75mm Bowl Tripods and the Leofoto DC-404C Center Column for 100mm Bowl Tripods are center columns specifically designed for 75mm and 100mm bowl tripods to add additional height. Made of carbon fiber for lightweight durability, it features a rapid column design with a large butterfly twist lock collar. The column base features a ballast hook that can be used to add weight for increased stability while the top features a reversible 3/8"-16 threaded mounting stud that can unthreaded and flipped to reveal a 1/4"-20 threaded mounting stud, making it compatible with virtually any head. Leofoto DC-364C Center Column for 75mm Bowl Tripods: Bowl adapter size: 75mm/ 2.95in Tube diameter: 32mm/ 1.26inLength: 425mm/ 16.73inWeight: 478g/ 1.05lb Leofoto DC-404C Center Column for 100mm Bowl Tripods: Bowl adapter size: 100mm/ 3.93in Tube diameter: 32mm/ 1.26inLength: 425mm/ 16.73inWeight: 510g/ 1.12lb