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If you have a real old Jenn Air Cooktop and need new knobs for it, this product might work for you. The newer Jen Air cooktops use a D shaped post on their electric range controls. Old ones use a rather oddly shaped one with rounded ends and a narrow middle. Jenn Air no longer makes these. I called and asked. There do not seem to be any old knobs floating around at the usual sites for that kind of thing. My old knobs were unreadable and getting grody, so I threw these together. They have a rectangular slot that encloses the entire post. They will NOT work on more modern cooktops which have a D shaped post, so check yours before ordering this.