Introduction: The 55mm ring adapter easily screw in any 55mm lens, and converts the thread size of your lens to the thread size of any other accessory (such as filters, hoods, flashes and lens converters). Extremely solid and lightweight. Specifically designed for your camera for a tight and secure fit. No wobbling or cross-threading. A must have accessory to unlock the full potential of your camera! Feature: The Male side ( to the side of the camera/Lens ) : 55mm The female side ( to the side of filter/Hood/Cap) : 49mm Color: Black. Material: Metal (high quality anodized black aluminum). 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 Includes: Camera Lens Ring Adapter x 1