3 and 4 hook collars, usually used for attaching stay wires to poles.
3.0mm thick Pre Galv steel.
Available with plain or Nyloc nuts.
The three hook collar clamps poles 1.25” (32mm) to 2.35″ (60mm), fits 1.5″ poles.
The four hook collar clamps poles 2.0” (50mm) to 2.75” (70mm), does NOT fit 1.5″ poles.
See article on stay wire supported installations.