Adopting aviation aluminum alloy, which is tough, resistant to and pressure, it is precision and hard-wearing. By sand surface treatment, it is sweat-proof and dirt-proof, and it allows you to screw wide-angle lens on telephoto lens. Perfect camera accessories for close shot. Feature - ColorBlack - Material: Aluminum Alloy - Package Size: 14x9.5x8cm - Made of aviation aluminum alloy, it is tough, resistant to impact, and pressure. - By sand surface treatment, it is with matte texture, sweat-proof and dirt-proof. - Allows you to screw wide-angle lens on telephoto lens. - Package includes 18pcs fileter ring adapters of different sizes; 9 rings and 9 step rings Ring 37-49, 49-52, 52-55, 55-58, 58-62, 62-67,67-72, 72-77, 77-82mm; Ring 49-37, 52-49, 58-55, 55-52, 62-58, 67-62,72-67, 77-72, 82-77mm - Lightweight and portable, easy to install, it can also improve the problem of partial vignetting. - Suitable for common DSLR cameras Package list: 1 x 37mm-49mm ring 1 x 49mm-52mm ring 1 x 52mm-55mm ring 1 x 55mm-58mm ring 1 x 58MM-62mm ring 1 x 62mm-67mm ring 1 x 67mm-72mm ring 1 x 72mm-77mm ring 1 x 77mm-82mm ring 1 x 49mm-37mm Step-down ring 1 x 52mm-49mm Step-down ring 1 x 55mm-52mm Step-down ring 1 x 58mm-55mm Step-down ring 1 x 62mm-58mm Step-down ring 1 x 67mm-62mm Step-down ring 1 x 72mm-67mm Step-down ring 1 x 77mm-72mm Step-down ring 1 x 82mm-77mm Step-down ring