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Q: I have a progessive sup looks like opening is 10.5 x 1.25 in abs . how is it installed and will it fit?

It installs exactly how a normal single fin would install to any single fin box, and your FCS center fin will go in it as it would into a pair of FCS fin tabs (using fcs hex screws to secure). I will admit, it is a tight fit for FCS Brand fins to get into, I sanded the two tabs a little bit on a cheap FCS Center fin to make it a little easier to get into the adapter. True Ames fins fit in a little easier. However the adapter fits perfectly into any Single fin box (U.S. or Aussie). Worth the purchase price to experiment with

Q: Is this product durable enough to suppot a home made foil mast?

Sorry I am not sure what kind of loads a mast puts on a fin box but if other fin boxes can handle it, so can ours.

Q: can you tell me the width of the opening of the fin box?

The slot that accepts the base of the fin is 1/4 inch wide. The center slot that accepts the metal pin is 9/16 inch. Not sure if that is what you mean by "opening". The fin box is an industry standard for almost all fins designed for a single fin surfboard.

Q: Is it installed similiar to a future center fin box, before laminating or after hot coat?

I installed mine after the hot coat.

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Ride the Wave of Innovation! 🌊

VERSATILE USE - Perfect for Longboards, Egg, Bonzer Shapes, and SUPs.
DURABLE DESIGN - Built to withstand the rigors of surfing.
EASY INSTALLATION - No Tool fin screws make setup a breeze.
LIGHTWEIGHT PERFORMANCE - Weighs only 0.1 kg for optimal maneuverability.
UNIVERSAL COMPATIBILITY - Easily fits any single fin known to man.

The SBS Surfboard Single Fin Box 10.5 Inch is the go-to choice for surfers seeking versatility and reliability. Designed to fit all single fins, this fin box is perfect for longboards, egg shapes, and stand-up paddleboards. With a lightweight design and easy installation using No Tool fin screws, it’s the ultimate upgrade for your surfboard.

Have a Question? See What Others Asked

I have a progessive sup looks like opening is 10.5 x 1.25 in abs . how is it installed and will it fit?

Is this product durable enough to suppot a home made foil mast?

can you tell me the width of the opening of the fin box?

Is it installed similiar to a future center fin box, before laminating or after hot coat?

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TrustScore 4.5 | 7,300+ reviews

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Skill Level	All
Item Package Dimensions L x W x H	10.47 x 1.77 x 1.42 inches
Package Weight	0.1 Kilograms
Brand Name	Santa Barbara Surfing
Manufacturer	Santa Barbara Surfing
Part Number	SBS-125

SBS Surfboard Single Fin Box 10.5 Inch

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