Information:

• Includes a Step Up filter adapter ring kit (37-49, 49-52, 52-55, 55-58, 58-62, 62-67, 67-72, 72-77, 77-82mm).
• Includes a Step Down filter adapter ring kit (49-37, 52-49, 58-55, 55-52, 62-58, 67-62, 72-67, 77-72, 82-77mm).
• Converts your lens thread size to the thread size of any other accessory (such as filters, hoods, flashes, and lens converters).
• Special aerospace aluminum alloy, high strength, impact resistance, twist and pressure resistance.