Dragonfly Optical High Quality 49Mm To 62Mm Step Up Ring These allow you to put smaller or larger filter attachments on to you camera by either stepping up or down the filter size The first number is the size of your camera lens thread The second number will be the size of the filter or accessory lens you wish to attach Made from aluminium alloy. Suitable for: DSLR & Bridge-type Cameras, DSLR with wide-angle lens, Medium Format Cameras, Camcorder & Video Cameras and HDV Cameras