15.6mm internal diameter, 25.5mm outer diameter. Honda OEM main / crankshaft bearing seal.
Honda part number 91201-GK8-003.
Suits below scooter models:
Honda Dio AF18, AF25 SP / SR G'
Honda Dio AF27, AF28 SR, ZX (all with AF18E engine)
Honda Tact, 2 stroke Giorno (with AF24E engine)
Honda Dio Fit AF27
Honda Dio with chassis number in range AF34-1000001 to AF34-2999999
Honda Dio SR, ZX with chassis number in range AF35-1000001 to AF35-1700000
and many more 2 stroke Honda engines with 14mm crank and 25.5mm housing including:
Honda Nifty 50 (AF06 chassis, also Eve / Smile / Spree)
Fullmark Tact with AF05E engine
DJ-1, Pal, Elite SE50 (not DJ-1RR)