This product is sold in sets of 4.
In horizontal installations, F-shaped pieces are used as vertical end trims, notching together the cladding for a seamless finish. In vertical installations, they are used as horizontal end trims. They can also be used to finish the top of the installation.
Trims must be cut to the correct length depending on the dimensions of your installation. More details are included in the installation guide that arrives with your order.