|a very small jar opener on a very small lens|
But at second thought, the small rubbers (!) actually came in very handy. I've purchased several small to extra-small C mount lenses in the last month and the big jar openers would not have worked on them. These little guys are ideal; without them some C mount lenses would be impossible to focus during shooting. I'll get myself some extra jar openers when I visit the States this summer and make sure they are Large.
|Twist jar openers XS|