This lens bayonets mount ring has long service time because it is wear-resistant and rust-proof. This lens bayonets mount ring is professional, which is a good repair part of your broken one. It is constructed of plastic material. The diameter is 5.8cm. The inner diameter is 4.1cm. The outer diameter is 5.9cm. This lens bayonets mount ring is suitable for Nikon 18-55 18-105 18-135 55-200 Features: Professional, Rust-proof, Repair Parts Item Name: Lens Bayonets Ring Material: Plastic Applicable Model: for Nikon 18-55 18-105 18-135 55-200 Features: Professional, Rust-proof, Repair Parts Size Details: Diameter: 5.8cm/2.28" (Approx.) Inner Diameter: 4.1cm/1.61" (Approx.) Outer Diameter: 5.9cm/2.32" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: Style A: 1 x Lens Bayonets Ring or Style B: 1 x Lens Bayonets Ring 1 x Screwdriver