The 37-43 St Up Ring by Bower is designed to allow a camera with a 37mm lens to attach to a filter or accessory with a 43mm thread size. This step up ring is precision engineered to ensure a secure and seamless connection between your camera and desired accessory, such as a lens hood or UV filter. Made specifically for photographers and videographers, the Bower 37-43 St Up Ring is a must-have accessory for expanding your creative possibilities and enhancing your photography equipment. Invest in this high-quality step up ring to achieve professional results in your photography projects.