The Heliopan 75-77mm Step-Up Ring (#140) is a step-up ring permitting the use of 77mm threaded filters on a 75mm threaded lens. Constructed of matte black brass, Heliopan step-up rings are highly durable and longer-lasting when compared to aluminum rings.
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I'm using these to attach filters I have for my mirrorless lenses onto my rangefinder lenses since they're mostly the larger 62mm size. Sometimes I have filters in particular sizes and not in others, so this is super helpful. These are somewhat heavy, but they're made of brass, and they don't jam like the aluminum rings I used to use in this way.
I use Heliopan step up rings to fit a lot of my more specialized filters on my lenses. They never bind, and they're easy to remove and move around when I need to take them off to store them. The fit on these rings is very good, and they thread on very smoothly.