The 30-37mm ring adapter smoothly screws onto the front of any 30mm lens, and converts the thread length of your lens to the thread length of any other 37mm accent (such as filters, hoods, flashes and lens converters Made of fantastic anodized black aluminum (metal) Color: Black Extremely stable and light-weight Specifically designed to your digicam for a decent and secure fit No wobbling or cross-threading The first number is often the lens thread size, the second number is the filter length of the accessory If the first number is bigger, it&;s a step-down ring If the 1st quantity is smaller, it&;s a step-up A must have accessory to free up the full prospective of your camera! NOTE: PLEASE VERIFY YOUR CAMERA&;S LENS THREAD SIZE BEFORE ORDERING This kit is compatible with 30MM lenses solely Lens sizes differ despite digicam brand or mannequin Your camera&;s lens thread size might be marked someplace on the lens barrel or printed underneath your lens cap This quantity is usually preceded through a "Ø" (diameter) symbol NOTE: The photos in the product are for reference only, please consult with the precise product