APPLICATION: Widely-used in converting the thread size of your lens to the thread size of many other accessories, such as filters, lens hoods, lens converters or flashes for better effect; Compatible with for , , Camera and so onHOW TO USE: The first number points to the lens thread size and the second number is the filter size; Step up rings provide a way to fit a larger diameter filter or accessory onto a smaller lens. rings work in the exact same way but instead provide a way to attach smaller accessories and filters to larger lenses; Can be screwed onto the front of the lens easily with great tightness; Very simple to set upULTRA LIGHTWEIGHT: It is designed to be ultra-slim and lightweight, keeping the filters close to the lens. Anti-corrosion metal construction makes it popular to be used during outdoor photography; Durable and well crafted surface; Great tightness and no wobblingColour: blackMaterial: aluminum alloyPackage Contents:18 x Step-up rings (including: 37-49, 49-52, 52-55, 55-58, 58-62, 62-67, 67-72, 72-77, 77-82mm)18 x Step-down rings (including: 49-37, 52-49, 58-55, 55-52, 62-58, 67-62, 72-67, 77-72, 82-77mm)Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.