This lens mount adapter ring is mainly used for connecting the for " PK K Mount Lens" to "cameras with for NEX E Mount". Suitable for NEX E Mount camera, such as for NEX-3 NEX-3C NEX-3N NEX-5 NEX-5C NEX-5N NEX-5R NEX-5T NEX-6 NEX-7 etc. Completely manual control, manual focus and manual exposure. There is no electrical connection on the ring so diaphragm control of the lens is set manually.It can focus to . Easy and smooth to install, remove and operate lens.Equipped with lock and stop pin.Made of high-quality material, durable for long time use. Material: Metal Color:Black Compatible lens: for PK K Mount Lens Compatible camera: for NEX E Mount Camera Item size: . 6 * 6 * 3.2cm / 2.4 * 2.4 * 1.3in Package List:1* Adapter Ring Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.