brand and high quality. Feature: Made of high-quality aluminum alloy material, durable, firm and stable for us to use. Transform caliber adapter ring, it can be installed in front of the lens to achieve different diameter share the same lens diameter filter, hood, additional lens or other accessories to achieve the purpose of increasing the lens diameter. Small-diameter outer thread for the connection end of the lens, a large-diameter internal thread for a variety of the same caliber filters, such as UV, CPL, starlight mirror, gray mirror, close-up lens hood, etc. Lightweight and portable, easy to install, and can save money, others can also improve some of the hidden corners of the problem. It is a small turn up conversion caliber adapter ring. Step-up Ring only, other accessories demo in the picture is not included Specifications: Item Type: Step-up Ring Material: Aluminum Alloy Size: 49mm/1.9in, 52mm/2.04in, 55mm/2.1in, 58mm/2.2in, 62mm/2.4in, 67mm/2.6in, 72mm/2.8in, 77mm/3.03in Color: Black Quantity: 1 Pc Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 1 x Step-up Ring