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Order by Dec. 16th for Christmas Delivery - UPS / FedEX / Post
Order by Dec. 16th for Christmas Delivery - UPS / FedEX / Post

I have a 10.5" centerfin box. I'm guessing the center tab gets removed so a fin can slide into the box?

You are correct the center tab gets removed to get the fin in place. Usually we pop them out during the sanding process with a pair of needle nose pliers. 

The tab is there as a part of the plastic molding process.