This item has been discontinued by the manufacturer and is no longer available.
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 (48mm 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 48mm Snap-On Lens Cap:
Finally I found this B+W snap lens cap that will not fall off. I had a no name or some name cap before that fell down somewhere in a state park on a rainy day irritating me quite a bit. I am happy to use this one on my walk around camera.
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