This stainless steel speculum with 130 mm blades that are curved for a more pleasant insertion.
You can adjust the opening height with a simple knob and also lock it in position.

The opening at the handle is approximately 1,3 inch ~ 33 mm wide and 1,6 to 2,6 inch ~ 40 to 65 mm long.
The two blades open to a maximum of approximately 3,9 inch ~ 100 mm