We call these "Windsor" Blace Leads, because of the knot we use at the top of the lead, similar to the knot on a tie.
The lead is made from one piece of webbing, knotted around a metal swivel connector at the top - this enables the knot to be loosened and the arms to be adjusted, one shorter, the other longer. It's very handy if you walk 2 dogs of different sizes.
The Windsor Brace connects to your normal lead for walking 2 dogs, or if you are game, connect 2 brace leads to walk 4 dogs!
The arms on this Regular Brace lead are each 50cm long when set evenly, 25mm wide webbing with medium Snap Hooks.