The 52MM Altura Photo Neutral Density Filter Set includes three circular filters with a height of 72mm: ND2, ND4, and ND8. These filters are designed to reduce light transmission evenly across the entire image, allowing for longer exposures and deeper depth of field. The threaded mount fitting ensures a secure attachment to your camera lens, providing high-quality filtration for a range of photography styles. This set is a valuable addition to any photographer's gear collection, offering versatility and creative possibilities.