CNC MACHINED STEP-UP LENS ADAPTER RING: The Fire Filters step-up ring is made from CNC machined solid aluminum and then a matte black electroplated finish. Because of the aluminum and electroplated finish on it, this step-up ring can withstand corrosion and abrasion, which are often encountered during outdoor photography. | PERFECT FITMENT FOR CAMERA LENSES & CAMERA FILTERS: This step-up lens adapter ring is the most compatible step-up ring for camera lenses and camera filters. It is designed to be ultra-slim and lightweight and can be easily mounted promoting more functionality and durability. | BEST COMPANION OF PROFESSIONAL PHOTOGRAPHERS: Well crafted design and excellent construction makes our step-up-ring the most sturdy and the best companion of professional photographers for outdoor photography. Our lens adapter ring can be easily cleaned with lens cloth provided with it. | OPTIMUM TRACTION & PERFORMANCE: Our step-up-ring is made from premium materials and provides efficient and appropriate traction for optimized performance. | 3 YEAR GUARANTEE & USA SUPPORT: We guarantee all fire filters to be free of defects for a period of 3 years. We guarantee you’ll be happy with your fire filter or we’ll provide you a 100% refund anytime within 90 days, a full two months past Amazon’s official return window. Call or email our Denver office if you have any questions or need anything at all. We’re here to help you!