What this is Filter holder made for Action 4 cameras. Holds 49mm screw-in filters (filters not included). Key benefits Durable, lightweight construction: precision-machined aluminum alloy offers high strength and toughness with a smooth, refined finish. Clean, consistent results: designed to position 49mm filters reliably on your Action 4, enabling predictable optical performance. Supports creative setups: accepts stacked 49mm filters to increase creative options and shooting flexibility. Main features Material: high-strength aluminum alloy — durable, corrosion-resistant, and finely finished. Compatibility: specifically designed for Action 4; accepts 49mm screw-in filters. Filter stacking: built to accommodate multiple 49mm filters for layered effects and enhanced control. Note: package includes the filter holder only; filters must be purchased separately. Practical use scenarios Outdoor action shooting: add filters to control glare or exposure when recording fast-paced outdoor scenes with your Action 4. Time-lapse and landscape: stack filters to fine-tune exposure and creative effects for wide scenic shots. Creative videography: combine filters for color, contrast, or diffusion effects when capturing artistic or experimental footage. Why choose this holder Made to match the form and function of the Action 4 while using a robust aluminum alloy build for long-term use. Keeps your 49mm filters organized and usable on a compact action camera platform, enabling more versatile shooting without bulky accessories. Important: this listing is for the filter holder only; 49mm filters are not included.