This is the STD size Piston Ring Set for Tohatsu,,Mercury Outboard Motor 40C 40D 50C 50D series models.

Brand:OVERSEE

MADE IN TAIWAN,CHINA.

Ring Diameter: (68MM) STANDARD size

Fit TOHATSU OEM number: 356-00011-0, 356-00011-1 ,and its second ring oem number 356-00011-0 ,356-00011-1, 346871230M  (IMPT: Check OEM part number before purchase!!!)

For Mercury Mercruiser Quicksilver Outboard part number: 16054A4, 39-16054A4