About this 3D model
These are caps to cover bare Fan or LED headers on motherboards. There are 2, 3, and 4 pin variants. Also, 3 of them are designed for sockets with shorter backs and 3 of them are designed for the sockets with the full height backs. This object was made in Tinkercad. https://www.tinkercad.com/things/5rcF3DP6Cdh