2 pcs Step Up Adapter Ring:1 pcs 60 x 6.8mm Step Up Adapter Ring & 1 pcs 55 x 6mm Step Up Adapter Ring Adapter ring is suitable for filters, close-up lenses and other attachments to lenses with different filter thread sizes. The Bower 40.5-52mm Step-Up Adapter Ring easily screws onto the front of any 40.5mm Lens, and allows you to convert to the 52mm threads of accessory items (such as filters, hoods, flashes and lens converters). 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). Product Name : Step Up Adapter Ring Material : Metal Male Thread : 52mm/2.05inch + 40.5mm/1.59inch Female Thread : 58mm/2.28inch + 52mm/2inch Size(Approx) : 60 x 6.8mm/2.36inchx 0.27inch(Max.DxH) + 55 x 6mm/2.16inchx 0.24inch(Max.DxH) Color : Black Weight : 7g + 6g Extremely solid and lightweight. Specifically designed for your camera for a tight and secure fit. No wobbling or cross-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 Content : 2 x Step Up Adapter Ring Only the above package content, other products are not included. Note: Light shooting 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.