The 30-37mm ring adapter easily screws onto the front of any 30mm lens, and converts the thread size of your lens to the thread size of any other 37mm accessory (such as filters, hoods, flashes and lens converters Made of high quality anodized black aluminum (metal). Color: Black. Extremely solid and lightweight. Specifically designed for your camera for a tight and secure fit. No wobbling or cross-threading. 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. A must have accessory to unlock the full potential of your camera! NOTE: PLEASE VERIFY YOUR CAMERA'S LENS THREAD SIZE BEFORE ORDERING. This kit is compatible with 30MM lenses only. Lens sizes vary regardless of camera brand or model. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap. This number is always preceded by a "" (diameter) symbol. NOTE: The pictures in the product are for reference only, please refer to the actual product. _x000D_window.adminAccountId=254075701;_x000D_ Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia