Pentax 110 uses this size

25.5 > 30.5  Heliopan #342...new stock...27.50

25.5SO  Olympus Tokyo slip-on lens cap...u/m...8.00

25.5FR  metal lens cap...u/m...4.00

25.5    Pentax Skylight...n/o...13.50

25.5    Pentax Close-up...n/o...13.50

25.5 SO    Kodak “Cloud 13” Yellow 8...chrome...n/o...u/m...8.00

25       Walz UV chrome nft ...u/m...8.00

25  >  37 step-up ring...new stock...7.00