Timbers laid as required, reaching from the keelson to the orlop-beams, to bind a ship and give additional strength. They are variously termed, as lower futtock-riders and middle futtock-riders. When a vessel is weak, or has broken her floors or timbers, riders are introduced to secure the ship, and enable her to reach a port where she can be properly repaired. Stringers are also used, but these run horizontally.