Description: Material: The filter is made of alloy material, which is durable. Easy to Install: After installing the adapter ring, tighten it with a wrench to remove it. Function: Protect lens filter, reduce blue tint caused by , and improve image quality. filter and filter also protect the camera lens, which has a certain dust effect. Performance: Variable and adjustable -400 filter with multiple gears, adjust the gears to suit more scenes. Occasion: Rotate to adjust the gear, it can be used for night photography, outdoor water photography, etc. Specification: Material: Alloy Interface size: 52mm Apply to: Hero11 10 Size Chart: 5.4cmx5.4cm/2.13inchx2.13inch Package Includes: 1 Adapter ring 1 ND filter 1 filter 1 Lens cap 1 Hex wrench Note: Please allow slightly errors due to manual measurement and different monitors.