K&F Concept 37mm lens filter adapter ring for 100mm system

This adapter can be used to attach a square kit filter holder to a compatible lens. The adapter ring fits lenses with a filter thread of 37mm. Made of aluminum according to aviation standards, extremely robust and durable. Suitable for 2 mm thick 100 mm filters of the K&F Concept rectangular filters Material: aluminum (black anodized); Dimensions ： 100 * 100 * 7mm;