Amerimax 5651400120 Z-Bar Flashing, 10 ft L, 3/8 in W, Galvanized Steel (Pack of 50)

Used to create a water barrier between the top piece of wood siding and the bottom piece. With an exterior wall being over 8 ft tall, used where 2 pieces butt together, keeping the water from running down the top sheet, between the joint and behind the bottom sheet. 10 ft length. Online purchases are in packages of 50.