These stabilizers are used to provide a solid foundation for larger keys. They are meant for keys bigger than 2u.
The set comes with four 2u pieces along with one 7u or 6.25u piece.
The Individual pieces are standalone variants. You will only get 1 piece (1 wire and 4 components)
Note: We had a few reviews for this product, but they were before we changed them to all PCB and Plate Mounted wires. I have taken down all the reviews before we had the product change.