The Leofoto LB Series Leveling Head with Butterfly Handle acts like a half ball and offers a range of +/-15°. It locks easily and securely in position with a twist of the large butterfly handle at the base of the ball. This leveling base installs on any tripod with a 3/8" mounting stud.
Half-Ball Type Leveling Capability
3/8"-16 Threaded Base Mounting Socket
3/8"-16 Tripod Mounting Stud
CNC-Machined Aircraft-Grade Aluminum
The anti-twist safety screw design uses three set screws on the platform to secure the ball head in place on top of the leveling base. 
LB-75LRC Leveling Head
Arca + Picatinny Hybrid Lever-Release Clamp