COMPATIBLE: 52mm to 49mm Step Down Ring Filter Adapter COMPATIBILITY: Compatible with all 52mm camera lenses & 49mm accessories. HOW TO FIND SUITABLE FILTER SIZE: Your lens thread size will be printed underneath your lens cap or written somewhere on the lens barrel. Please do make sure to order the correct size otherwise it will not fit on your camera lens. PREMIUM MATERIAL: Made of high-quality anodized aluminum, the ring has a strict surface treatment to avoid shaking or cross threading, and the ultra-thin design makes it durable and practical. AFTER-SELL SERVICE: 30-day quality assurance, worry-free returns and exchanges, please contact us if you have any questions