This fin box requires gluing to the bottom of your board or kayak. It will fit a standard fin and use a standard square nut and bolt found  on most center fins (not included).
 
 
Be careful not to force or tap on the part of the fin where the fin bolt goes through, it can break.
Be careful not to tap or push on the propeller guard as it could damage it.
 
We recommend HH-66 adhesive to attach. The plastic fin box comes with a precut vinyl piece that can go around it and be glued to the fin box and board providing more surface area for adhesion.
Note: Adhesive is not included.