Two small clips on the back secures the eyepiece onto your camera. - Replaces Nikon Eyecup DK-23. - 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. Camera Eyecup Eyepiece DK-23 Replacement Viewfinder Protector for Nikon DK23 D70S D7100 D300S D300 Replacement Eyecup for Nikon DK23 to prevent light entry due to bulb shutter long exposure.A great accessory for all photographers. Compatible with Nikon D70S D7100 D300S D300 DSLR Camera. Provides protection for the camera eyepiece and keep the camera viewfinder away from dust. Brand Nikon SKU NI736EL0LCYVCNAFAMZ-112200 Model 35001054