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Fits perfectly: It is neither too loose nor too tight used on the Leica E39M lens, such as Summicron 50mm/f2, and Summicron 35mm/f2.8.
It won't easy fall down but it also won't scrape up your lens while taking it on or off. With flannel to protect the lens at contact surfaces.
This model is very light aluminum, but it does not fragile or malleable.
Inside diameter 42mm, suits for Leica E39 series lenses.
High quality aviation aluminum as raw material, One processing polished. Note: Does not include the camera and Lens.
JFOTO Qb-C Metal Black Lens Cap Cover for Leica L39 E39 39mm Summicron Summaron Tinra 35 2 M50 2 Internal Diameter 42mm1.65in B07FP63TFY