Features This lens mount adapter ring is designed to connect Pentax PK K Mount lenses to cameras with Sony NEX E Mount. Compatible with Sony NEX E Mount cameras, including Sony NEX-3, NEX-3C, NEX-3N, NEX-5, NEX-5C, NEX-5N, NEX-5R, NEX-5T, NEX-6, NEX-7, and other E Mount models. Provides full manual control, including manual focus and manual exposure. No electrical connection, so lens diaphragm must be adjusted manually. Allows infinity focus. Smooth and easy to install, remove, and operate. Equipped with locking mechanism and stop pin for secure attachment. Constructed from high-quality metal for durability and long-term use. Specifications Material: Metal Compatible Lens: Pentax PK K Mount Lens Compatible Camera: Sony NEX E Mount Camera Item Size: Approx. 6 x 6 x 3.2 cm (2.4 x 2.4 x 1.3 in) Item Weight: Approx. 98 g (3.4 oz) Package Size: Approx. 6.8 x 6.8 x 3.5 cm (2.7 x 2.7 x 1.4 in) Package Weight: Approx. 105 g (3.7 oz) Package List 1 x Adapter Ring