Step-down 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, such as filters, hoods, flashes and lens converters. Provide a way to fit smaller diameter filters or accessories onto a larger lens. Made of premium grade aluminum for great durability. Polished and finished with anodized matte surface. Compatible with the Canon, Nikon, Sigma, Tamron Camera. Fit most lens with the same filter thread, manual or autofocus, digital or film. Material: Anodized Aluminum Color: Black. APPLICATION: Provide a way to fit smaller diameter filters or accessories onto a bigger 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. Note: 1.The first number is always the lens thread size, the second number is the filter size of the accessory. If the first number is bigger, it's a step-down ring. 2.Give you the ability to connect screw-in filters to different size lenses. For instance, you can connect a 67mm filter to a 72mm lens by placing the 72-67mm ring on the lens and then screw the filter onto the step-down Ring. 3.Please verify your camera's lens thread size. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "Ø" (diameter) symbol. For example: Ø49= 49mm lens thread size. Brand No Brand SKU 101162370_NP-1021890084