The Nikon LC-77 is spare or replacement Snap-On Lens cap for Nikon lenses with a 77mm filter thread.
Pentax O-LC77 77mm Front Lens Cap
USED Kase Revolution Magnetic Circular Filters 77mm Pro Kit
Tiffen 77mm Glimmerglass 1 MCS Filter
Kase Revolution Magnetic R-MCUV + Adaptor 77mm
Urth 77mm Lens Filter Caps
Urth 77mm Plus+ Hard Graduated ND8 Lens Filter
