Feature A Versatile Rotation Feature, Support 360Adeg Horizontal and 90Adeg Drop-Notch Vertical Rotation for Flexible Positioning. A Dual ARCA Type QR Plate and Picatinny Mount, Compatible with Various Optics. A Stable Tripod Head, 38mm Diameter Ball Head, Max Load 20kg (44lbs) , Fit for RSCF-T01 Tripod. A Smooth Knob Adjustment, Tension Control for Precise and Effortless Movement. Specification Material: 6061-T6 Aluminum Alloy Base Mount: 3/8&';&';-16 Threaded Socket Ball Diameter: 38 mm / 1.5 in Base Diameter: 51 mm / 2.0 in Height: 91 mm / 3.6 in Weight: 430 g / 15.2 oz Max Load: 20 kg / 44lbs Size