8.5" BLACK US BOX for single fin

8.5" US fin box by Fins Unlimited (21,60cm). Color black.
Generally used for bonzer, single or other one hybrids (type wombat), less than 7'5".

• Length: 21,6cm
• Outside width: 2,5cm
• Internal width / base of drift: 0,9cm
• Depth, to take into account for the minimal thickness of the shape: 2,5cm.

US Box allows the fixation of removable fin for single fin surfboards.