This lens mount adapter ring is mainly used for connecting the for "Pentax PK K Mount Lens" to "cameras with for Sony NEX E Mount". Suitable for Sony NEX E Mount camera, such as for Sony 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 infinity. 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 Pentax PK K Mount Lens Compatible camera: for Sony NEX E Mount Camera Item size: Approx. 6 * 6 * 3.2cm / 2.4 * 2.4 * 1.3in Package List:1* Adapter Ring Only the above package content, other products are not included. Note: Light shooting 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.