Two small clips on the back secures the eyepiece onto your camera. Replaces Nikon Eyecup DK-24. Custom designed soft-touch eyecup to provide cushioning around the camera's eyepiece. Block out unwanted light from your viewfinder. Useful for eyeglass wearers and others to keep the tip of the nose from touching the camera body. Replacement Eyecup compatible with : Nikon D5000 D5100 D3000 D3100 Camera It is a perfect Custom designed soft-touch eyecup to provide cushioning around the camera's eyepiece. Plastic body cushioned with soft rubber for comfort and protect your eyes. Block out unwanted light from your viewfinder. Eyepiece sensor for automatic display switching Approx.100% field coverage Eyecup for Nikon, replaces your lost, damaged or broken eyepiece. Features a soft outer edge rubber cushion and plastic body. Suitable for the professional technicians.