Shelf Bracket -Macro Reverse Mount Adapter Highlights Generic Brand Macro Reverse Mount Adapter Description: Screw Diameter: 58mm Material: Anodized Aluminum When you reverse and mount your lens, install this adapter to protect the rear part of your goal. Include mounting part, lens part and electronic part, to avoid unexpected damage and contamination. In addition, the ring has a 58 mm thread. You can attach filters such as UV, CPL and a lens cap to it to prevent dust from entering the lens. Specification: 1. Remove the lens from the camera. 2. Rotate the EOS-58 reverse ring on the camera. 3. Screw the front part of the lens into the EOS-58 reverse ring. 4. Rotate the rear protective ring on the back of the lens. 5. If there are lens caps or filters, you can screw them into the reverse protection ring. Suitable for: All Canon EF, EF-S and EOS lenses. Package includes: 1x EOS System Back Cover Ring 1x EOS-58mm Reverse Ring