NT R Royal Bottom Concealed Pivot Hinge

Bottom pivot hinge

All TBT hinges are handed the same way and ALWAYS when viewing the window from INSIDE

Left hand suits windows with the hinges fitted to the left hand side.

Right hand suits windows with the hinges fitted to the right hand side.

or you can use the following.

If the window handle is on the right then left hand hinges are required

If the window handle is on the left the right hand hinges are required.