Step-up filter adapter ring set can easily screw onto the front of any lens, and convert the thread size of your lens to the thread size of any other accessory Provide a way to fit larger diameter filters or accessories onto a smaller lens. Compatible with the Canon, Nikon, Sigma, Tamron Camera. Fit most lens with the same filter thread, manual or autofocus, digital or film. Premium Anodized Aluminum Step-Up Lens Filter Adapter Rings 52mm-55mm KIT INCLUDES: 1 Pcs Step-up Adapter Rings: 52-55mm APPLICATION: Provide a way to fit larger diameter filters or accessories onto a smaller lens. You don't need to buy more filters when you have different lens. DURABLE MATERIAL: Made of premium grade aluminum for great durability. Polished and finished with anodized matte surface WIDE COMPATIBILITY: Compatible with the Canon, Nikon, Sigma, Tamron Camera. Fit most lens with the same filter thread 37mm NOTE: The first number of an adapter ring is always the lens thread size, the second number is the filter size of the accessory. If the first number is smaller, it's a step-up ring