Steel,solid,bueatiful shape,easy to install,used for different machines Quick ... ID,55mm OD1-1/4" ID,2-5/32" OD Steel 25mm ID,39mm OD1" ID,1-1/2" OD32mm ID ... /8" OD32mm ID,51mm OD1-1/4" ID,2" OD Steel 25mm ID,39mm OD1" ID,1-1/2" OD32mm ID ... " OD Threaded Quick Coupling Nylon 1-1/4"32mm2"51mm Steel 1-1/4"32mm2"51mmAll the size and thread type ...