【Magnetic & Thread 2-in-1】The lens filter cap can screw on the lens, also can obsorb on the filter via magnetic.
【Aviation Aluminum Alloy】Made by aviation aluminum alloy, hard and anti-impact enough.
【Note】1.This lens cap magnetic function is only suitable for K&F Concept magnetic filters and all brands of common camera filters,not compatible with other brands of magnetic filters
2.2) If your lens filter is magnetically adjustable ND, then your lens cap needs to be increased in size. eg: 77mm ND magnetic filter suitable for 82mm magnetic lens cap.