SUP Board Stand Up Board Surfing Accessories Fin Box Adaptor for US Fin Box Adaptor to Slid-in Finbox

Fin ADAPTOR

it is desinged for sup board US fin box
with this adaptor, it turned out to be a inflatable boat fin base structure which
can add relevant fin, as well as AQUA MARINA electric power fin

Brand: Aqua Marina
Dimensions: 21.2*5.2*4.5cm/8.3"*2"*1.8"
Material: PA66+30%GF
Shaft: Stainless Steel
Screw Hole: 4mm