The Manfrotto 438 Compact Leveling Head provides fast levelling for tripod heads without built-in levels. It mounts directly on the Duzi slider 3/8" stud and has 10° range of adjustment. It features a 3/8" socket at it's base and a 3/8" screw at it's top. Three anti-twist screws prohibit unwanted rotation of the tripod head, camera or other attached devices.