Product Name: M48-M42 Adapter Ring Product Code:TA3108 Description: It is used for the stereo microscopes to attach a ring light, or change the mounting thread to different size. 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. Material: Aluminum Alloy Size: Internal Thread: M48x0.75mm/0.02in, External Thread: M42x0.75mm/0.02in Color: Black Package include 1pc X M48-M42 Adapter Ring |