Product Details
Color  Bone and Black
This is the Larger box. 
The Lokbox fin box is the most versatile anchoring device for a surfboard fin available today.
The Lokbox uses a tapered cavity and matching fin base, providing a very solid attachment from fin to board. The Lokbox can be easily installed on the foam blank, or after glassing.
Lokbox fins can be adjusted in the box 025 inch forward or 0.25 inch back from the shapers fin position.