Dual Interface Expansion: Dual interface design at the bottom, the middle 1/4Inch screw port is folded up for interface, more abundant expansion. All-aluminium alloy material: anti-drop and anti-rust, sturdy and , weighing only 27g, without increasing the burden of travel. Newly upgraded Firmness doubled: built-in magnets, quick release accessories and action camera instantly attached in place. Applicable range:For action3/4/5pro Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Specification:Quarter Dock Colour:As Shown Material:aluminium alloy Package Contents: 1 * base Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.