About This Specification: Color: Black; Material: Aluminum Alloy, Plastic; Male Thread Diameter: 58mm / 2.28 Inch; Female Thread Diameter: 58mm / 2.28 Inch; Height: 5.5mm / 0.22 Inch; Packing List: 1 Pcs x Step Down Ring Advantage: This step-down ring is made of durable anodized aluminum alloy, offering high strength, impact resistance, and excellent durability against twisting and pressure, ensuring long-lasting performance without deformation. The precision-polished surface prevents wobbling and cross-threading, while the compact design ensures easy, secure installation. Application: This step-down Ring adapter allows smaller aperture lenses to share the same filters, lens hoods, additional lenses, and other accessories. It also helps reduce the lens aperture, making it a versatile solution for various photography setups. Works with ND, IR, DSLR lenses, and more. Instruction: Simply screw the step-down ring onto the lens, and attach your desired accessory to the other side for a secure fit. NOTE: Please verify the thread sizes before purchase to ensure a proper fit and avoid malfunction. Do not tighten excessively to prevent cross-threading.