Filter Thread Macro Lens Reverse Ring Camera Mount Adapter Female Thread 2inOOTDTYfeatures: Made of premium metal and aluminum, durable and long-lasting service. Smooth surface for easy installation. The lens diaphragm control is set manually. Internal thread size: SCT thread (2 inch, 24 teeth thread), internal thread depth: 6mm, external thread spec: M48x0.75mm. Specification: Material: Metal + Aluminum Internal Thread Size: SCT Thread (2 inch, 24 teeth thread) Internal Thread Depth: 6mm Specifications External Thread: M48x0.75mm External Thread Depth: 4mm Flange Distance: 8mm Optical Hole Diameter: 45mm Light Through Hole Inner Wall: Bending Thread Package Included: 1x Reverse Intermediate Ring Note: Please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.