The B+W Snap-On Lens Cap #310 model has two spring-mounted claws at opposite sides which attach to the inside of the filter or lens threads. They work on any lens or front-threaded filter with the filter size that matches the size you see here (55mm in this case). If you have a filter on your lens which has no front threads, you would instead need a B+W #305 model cap.
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Comments about B+W #310 55mm Snap-On Lens Cap:
Simply said, it just works, and is well built. Replaced the push on and easily lost Leica caps.
Pros
Cons
Best Uses
Comments about B+W #310 55mm Snap-On Lens Cap:
I was looking for an inexpensive snap on lens cap for my lens. The lens came with a push on cap which does not stay on when a filter is attached. This lens cap is of excellent quality, fits perfectly, is easy to put on and take off and stays put. I could not ask for anything more. Highly recommended.
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