This housing stop loops over the seatpost bolt between the "ears" of the seat lug/seatpost clamp.
Includes adjusting barrel.
This is rather long, which is good news and bad news:
•Good News: improved cable routing for smoother brake operation.
•Bad News: For smaller frames, there may not be sufficient clearance between the seatpost bolt and the cable yoke.
Stainless Steel with aluminum adjusting barrel.