Product Name : Step Up Adapter Ring;Material : Metal Male Thread : 52mm/2.05 inch;Female Thread : 58mm/2.28 inch Size() : 60 x 6.8mm/2.36 inchx 0.27 inch(Max.D x H);Color : Black Weight : 18g The 52-58mm ring adapter easily screws onto the front of any 52mm lens, and converts the thread size of your lens to the thread size of any other 58mm accessory (such as filters, hoods, flashes and lens converters). Extremely solid and . Specifically designed for your camera for a tight and secure fit. No wobbling or -threading. 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. Package Contents: 3 x Step Up Adapter Ring 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.