Adopted with aviation aluminum alloy, which is with high strength, impact resistance, and pressure, durable and lasting for use.With sand surface treatment machining process to a matte texture and quality, sweat-proof and dirt-proof. Allows you to screw wide-angle lens on telephoto lens. Perfect camera accessories for close shot. Set of 18pcs fileter ring adapters of different sizes. Use these and rings to take better pictures! Features - Adopted with aviation aluminum alloy, which is with high strength, impact resistance, and pressure, durable and lasting for use. - With sand surface treatment machining process to a matte texture and quality, sweat-proof and dirt-proof. - Allows you to screw wide-angle lens on telephoto lens. Perfect camera accessories for close shot. - Set of 18pcs fileter ring adapters of different sizes: 37-49-52-55-58-62-67-72-77-82-77-72-67-62-58-55-52-49-37mm. Using these and rings to take better pictures. - Lightweight and portable, easy to install, it can also improve the problem of partial vignetting. - Suitable for Canon, , and other 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