Pacific Vibrations Clear Acrylic Surfboard Wall Rack smaller fin Horizontal This rack is weighted to hold surfboards up to 50 lbs. Board Width: this rack has a 4" opening to fit surfboards up to that width. Surfboard Fins: this rack comes in 2 sizes, 6 fin and 10" fin to accommodate displaying boards with fins facing the wall.(Or course, you can display your board fins out, too.) This size smaller fin holds surfboards with fins up to 6" long with the fins facing the wall. Or longboards with the fin facing the display side.