Description: brand new and high quality. Feature: Made of high-quality Aluminum Alloy material, durable, firm and stable for us to use. It is used for the stereo microscopes to attach a ring light, or change the mounting thread to different size. Designed with long-distance holes for greater use and suitability. It can also be used with adapter ring for M48 to other mount camera body, thus M42 mount lens can be installed onto other mount camera body. M48 to M42 Adapter Ring only, other accessories demo in the picture is not included! Specifications: Item Type: M48 to M42 Adapter Ring Material: Aluminum Alloy Size: Internal Thread: M48x0.75mm/0.02in, External Thread: M42x0.75mm/0.02in Color: Black Quantity: 1 Pc Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x M48 to M42 Adapter Ring