This part is intended to be used in building a 1/24 model of the Lunar Rover (LRV). This part is the TV camera. For indications on building the model please refer to http://spacemodels.nuxit.net/1-32 LM.
On apollo 16 and 17 there was a sunshield in front of the camera to protect it again sun glares. This is too thin to print at 1/24 so you will need to cut it and assemble it using either styren or paper with the provided pattern.