Check the listing for details. 18pcs Camera Lens Filter Adapter Kit 9pcs Step Up Ring & 9pcs Step Down Set. Condition: New. Listed at 10.70 USD. 18pcs Camera Lens Filter Adapter Kit 9pcs Step Up Ring & 9pcs Step Down Ring Set The ring adapter easily screws onto the front of any lens, and converts the thread size of your lens to the thread size of any other accessory (such as filters, hoods, flashes and lens converters). 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. If the first number is smaller, it's a step-up ring. This Camera Lens Filter Metal Stepping Rings kit is Optional for 9pcs Step Up Ring Set & 9pcs Step Down Ring Set Step Up Filter Adapter Ring Kit: 37-49, 49-52, 52-55, 55-58, 58-62, 62-67,67-72, 72-77, 77-82mm Step Down Filter Adapter Ring Kit: 49-37, 52-49, 58-55, 55-52, 62-58, 67-62,72-67, 77-72, 82-77mm.