The True Ames Hexcore Single Tab Side Bites Fin Set are designed to provide the maximum amount of performance when added to a single fin on 2 + 1 surfboards. A great all around template, these fins will provide that extra level of stability, projection, and hold you are looking for out of your setup. Fin Size Detail table { border-collapse: collapse; } thead th{ background: #F3F4F6; color: #252627; padding: 8px; border-right: 1px solid #555; border-bottom: 1px solid #555; border-left: 0; } thead th:last-child { border-right: none; } td{ padding: 8px; border-right: 1px solid #555; border-bottom: 1px solid #555; border-left: 0; } tbody tr:last-child td { border-bottom: none; } tbody td:last-child { border-right: none; } /* bottom-right cell: guaranteed */ tbody tr:last-child td:last-child { border-right: none; border-bottom: none; } Size Height Base Area Small 3.25" [84mm] 3.38" [85.85mm] 8.38"² [54.06 cm²] Medium 3.70" [93mm] 3.63" [92.20mm] 10.25"² [66.12 cm²] This 3/4" Futures Fin Base Does Not Fit For Rear Quad. The 3.7" are their most often recommended size.