K&F CONCEPT 18pcs Camera Lens Filter Step Up/Down Adapter Ring Set 37-82mm 82-37mm for Canon Nikon Sony DSLR Camera Lens Features Include Step Up Filter Adapter Ring Kit(37-49, 49-52, 52-55, 55-58, 58-62, 62-67,67-72, 72-77, 77-82mm) Include Step Down Filter Adapter Ring Kit(49-37, 52-49, 58-55, 55-52, 62-58, 67-62,72-67, 77-72, 82-77mm ) Great tightness,no wobbling or cross-threading. Ultra-low chemical residues, attached to a solid! Converts the thread size of your lens to the thread size of any other accessory (such as filters, hoods, flashes and lens converters). Special aviation aluminum alloy, high strength, impact resistance, twist and pressure. What is a step up ring Step up rings, also known as adaptor rings, allow you to use filters and accessories that arenot the same size as your cameras lens. Lenses and filters come in a large range of types andsizes and unfortunately they don't always fit together correctly. Fortunately there is a step upor step down filter for just about any need. ow step up rings work Step up rings provide a way to fit a larger diameter filter or accessory onto a smaller lens.The step up rings screws onto your lenses threading and provided a larger thread with with