All metal material, surface anodized anti-oxidation treatment, CNC processing, it is made of aluminium
All metal knob, more durable and non-aging
It is can connext with your flash, easy for shooting
It is compatible with any Arca style plate such as, RRS, ARCA-SWISS/ KIRK/ Wimber ley/ MARKINS/ SUNWAYFOTO/ kangrinpoche/ BENRO/ SIRUI etc Within a 1/4 to 3/8 convert screw
Mounting Thread3/8 to 1/4 convert screw
Item Length: 3.77/96mm Width: 0.98/25mm Height: 0.59/15mm
Item Weight: 1.76oz/50g
Packaging included: 1clamp for quick release plate 13/8 to 1/4 convert screw.