Four very good quality Victorian cast iron circular swivel windows with a segmented triangular design. The windows open perfectly with no wear to the pins or frames and the rebated section fits snugly into place when closed. They all open a little past center then stop on a stop, which you can see in images ten and eleven, at the bottom where it's pinned. They have catches to secure them when closed, and eye hooks to open them with a pole, those may need a little refurbishment.They are ready to build into something with the external securing extending arms still intact 1.75 inches, and 17mm glazing bars for the glass or double glazing.