1、When you reverse and mount your lens, installing this adapter then it can protect your lens rear part. 2、Include mounting part, lens part and electronic part, to avoid unexpected damage and contaminate. 3、In addition, you can attach filter such as UV, CPL and lens cap to prevent dust getting into the lens. 4、Made of high quality plastic and alloy, it is free from rust, scratch and damage. 5、The installation is easy to operate and requires no other assembly tools.Features:When you reverse and mount your lens, installing this adapter then it can protect your lens rear part.Include mounting part, lens part and electronic part, to avoid unexpected damage and contaminate.In addition, you can attach filter such as UV, CPL and lens cap to prevent dust getting into the lens.Made of high quality plastic and alloy, it is free from rust, scratch and damage.The installation is easy to operate and requires no other assembly tools.Specification:Condition: Brand NewMaterial: Plastic + AlloyColor: BlackType: EOS-58mmItem Diameter: Approx. 6cm / 2.4in Weight: Approx. 45-51gPackage List:1 * Reverse Protection Ring1 * Reverse Ring Features:When you reverse and mount your lens, installing this adapter then it can protect your lens rear part.Include mounting part, lens part and electronic part, to avoid unexpected damage and contaminate.In addition, you can attach filter such as UV, CPL and lens cap to prevent dust getting into the lens.Made of high quality plastic and alloy, it is free from rust, scratch and damage.The installation is easy to operate and requires no other assembly tools.Specification:Condition: Brand NewMaterial: Plastic + AlloyColor: BlackType: EOS-58mmItem Diameter: Approx. 6cm / 2.4in Weight: Approx. 45-51gPackage List:1 * Reverse Protection Ring1 * Reverse Ring 1 * Reverse Protection Ring1 * Reverse Ring