Specification Brand : LingoFoto BulletPoint1 : 【Compatibility】The first size is the size of the lens(42mm), and the second size is the size of the filter(39/40.5/42/43.5/43/46/49/52mm) BulletPoint2 : 【Function】Small lenses can be equipped with large-sized filters, while large-sized lenses can be equipped with small-sized filters, saving the trouble of replacing lenses BulletPoint3 : 【Material】Aluminum alloy,high strength,impact resistance,distortion and pressure BulletPoint4 : 【Surface】High mesh mechanical sand blasting,Environmental protection anodizing BulletPoint5 : 【Package included】filter adapter ring*1 ExternallyAssignedProductIdentifier1 : 049383050615 ExternallyAssignedProductIdentifier2 : 0049383050615 ExternallyAssignedProductIdentifier3 : 00049383050615 GpsrSafetyAttestation : 1 ItemName : 42-39/40.5/42/43.5/43/46/49/52mm Step Up & Step Down Rings Adapter for Lens and Filter 42-40.5 Filter Adapter Ring 42mm Lens to 40.5mm Filters ItemPackageDimensions_Height : 10.7 centimeters ItemPackageDimensions_Length : 1.5 centimeters ItemPackageDimensions_Width : 9.1 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : camera-lens-filter-step-up-rings Language : english Manufacturer : LingoFoto Material : Optical Glass ModelNumber : 77DF2 PartNumber : NP8883-YJY PhotoFilterEffectType : Enhancing PhotoFilterSize : 77 millimeters PhotoFilterThreadSize : 77 millimeters ProductDescription : Description: Explanation: The filter adapter ring can be easily screwed onto the front of all lenses and can adjust the size of your lens line to match the line size of other accessories such as filters, shields, flashlights, and lens converters. For example, by placing an 42-39mm adapter ring on the lens, connecting a 39mm filter on the 42mm lens, and then tightening the filter with screws on the stepper ring. The first number is always the size of the lens screw. The second number is the filter size. If the first number is small, it is a step up ring, and if the first number is large, it is a step down ring. Specifications: Material:Anodized aluminum Color: Black Package content: 1 * adapter ring Note: Please confirm the lens size of the camera in your hand. The lens line size of the camera you are using is displayed somewhere on the lens barrel or printed under the lens cover. This number must be preceded by the symbol 'Ø' (diameter). For example, Ø 37=37mm lens screw size