SunwayFoto DT-01D50 Monopod Tilt Head with Clamp, 26.45lbs Capacity SUNWAYFOTO brand Arca-Swiss compatible 50mm Screw Knob Clamp Precisely engineered / exact Arca Standard (39mm) Max load: 12kg (26.5 lbs) All Metal knobs. For long term durability. Modular design with both top and bottom Arca compatible dovetails.