COMPATIBILITY: All rings have the same outer diameter and will work with most follow focus systems (standard 32 pitch - 0.8 mod) SET OF 3: Each focus ring are adjustable and fit 65mm, 75mm, and 85mm lenses 1-YEAR WARRANTY: We’ve got your back! Our products are designed to ease your technical woes, not add to them. Our friendly US-Based support is here to help DURABLE: Made with hard plastic, the lens rings can endure the rigorous turning and adjusting without breaking easily PROFESSIONAL FOCUSING: These lens rings feature a large pitch diameter so you can accurately focus your subjects clearly and in-frame with ease