This is the same hanger we include in many of our kits, but we also used it to finish Made With Love: Sail, so it's now available to purchase separately.
The dowel is drilled at both ends and the wire fits in the holes. Gently pull the wire off one end of the dowel and slip it into a casing on the back of your stitched piece. Replace the wire in the hole. Easy!
SamSarah distributes the Ackfeld pieces we use with our designs. They are also available directly from Ackfeld.