40.5-82mm 46 49 52 55 58mm Camera Protective Screw-in Metal Lens Filter Case Cap

Works as a good screw-in lens cap. More easier to set-up or tear down your filter from lens. Notes: it just can fit for the round filter,not for the square filter. This is a new design for protecting your UV/CPL/ND filters, which is easy carrying.

eBay