55mm Variable Fader ND2-ND32 ND + CPL Filter 2 in 1 - No X Spot Weather Sealed

SKU: KF01.1321

Q
I just bought the k&f concept 82mm variable fader nd2-nd32 nd filter and i bought the 82mm lens cap but doesn't fit. what size lens cap fits this?
Answer Question
A
For this series, front thread diameter is bigger than the back thread diameter. 67mm nd+CPL filter, the lens cap should be 77mm 72mm nd+CPL filter, the lens cap should be 82mm; 77mm nd+CPL filter, the lens cap should be 86mm; 82mm nd+CPL filter, the lens cap should be 95mm