This part is intended to be used in building a 1/32 model of the Lunar Rover (LRV). This is the gravimter when remeased from the aft pallet of the LRV for the Apollo 17 mission. In case you have the aft pallet with the gravimeter attached to it, this part is not needed. For indications on building the model please refer to http://spacemodels.nuxit.net/1-32 LM