The Manfrotto 520BALL 75mm Half Ball is designed to facilitate quick leveling of a 75mm ball head with the 3283 tripod, and has a 3/8"-16 threaded screw. It can also be used with the Gitzo G-1422 75mm Bowl Interface Adapter to provide an economical and low profile levelling base with any of the Gitzo Series 3 "systematic" tripods(which feature an interchangeable top plate that accepts rapid or geared center columns as well as levelling bases).
Replaces part number 3284.
This product can expose you to chemicals including lead, which is known to the state of California to cause cancer and birth defects or other reproductive harm.