Bronze Turn Fin -aka- Tracking Fin. this fin was used on some American Skiers, Tige, Supra, Moomba, Sangers Flat base (not v base) Depth: 7" Length at base: 6 1/4" Width at base: 3 1/2" With (4) mounting holes, Front to back (center to center) : 4 3/8" Side to side (center to center) : 2 1/2"