The Leofoto LB Series Leveling Base with Butterfly Handle acts like a half ball, with the LB-38 mini providing a leveling range of +/-10°, while the other models in the series offer 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 LB-38 Mini: 1/4"-20 Top Mounting StudLB-60N, LB-65, LB-75/S: 3/8"-16 Top 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-38 Mini Leveling Base: Top diameter: 38mm / 1.50inBase diameter: 33mm / 1.30inHeight: 38mm / 1.50inMax load: 3kg / 6.61lbWeight: 80g / 0.18lb LB-60N Leveling Base: Top diameter: 60mm/ 2.36inBase diameter: 53mm/ 2.08inHeight: 50mm/ 1.96in Max load :15kg/ 33lbWeight: 206g/ 0.45lb LB-65 Leveling Base: Top diameter: 65mm/ 2.56inBase diameter 60mm/ 2.36inHeight: 53mm/ 2.08inMax load: 18kg/ 39.68lbWeight: 234g/ 0.51lb LB-75 Leveling Base: Top diameter: 75mm/ 2.95inBase diameter: 75mm/ 2.95inHeight: 59mm/ 2.32inMax load: 25kg/ 55lbWeight: 322g/ 0.71lb LB-75S (Leveling Base with Adapter for 75mm Tripod Bowls): Top diameter: 81mm/ 3.18inBase diameter: 81mm/ 3.18inHeight: 77mm/ 3.03inMax load: 25kg/ 55lbWeight: 346g/ 0.76lb Compatible models: Leofoto LN-364C, LM-32XC, LM-36XC Leofoto LB Series Leveling Base Manual