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 (62mm 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 62mm Snap-On Lens Cap:
Perfect application for my lens. Fit is exact, value for cost is excellent. Responsive compression springs. Instant grip when covering lens. No frustration at all with this product. [...]Just awesome all the way around.
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