【1】40.5mm to 52mm Step-Up Ring Filter Adapter 【2】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. 【3】Compatibility: Compatible with all 40.5mm camera lenses & 52mm accessories. 【4】How do I find my filter thread 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. 【5】30-day quality assurance, worry-free returns and exchanges, please contact us if you have any questions！ Step-Down Ring Step-up Ring Filter Adapter ,for All Brands UV ND CPL, Metal Ring