These are bayonet mount filters that go on the rear of the lens. The fit the Nikkor 16mm f/2.8 lens, Nikkor 13mm f/5.6 and the 15mm F/3.5 lenses.
Cosmetic: Almost no wear.
Optical: Filter is excellent. Free from all marks.
Graded: Like New Minus
(Close inspection reveals slight signs of wear. )