Replacement M6 Stainless Steel T-nuts for the any hydrofoil that uses the M6 T-nut, including Takuma, Naish and others. They are sold each, so if you need a set of 4 make sure to buy 4 of them.
Total dimensions:
Track width: 8.5mm
Total width: 14.9mm
Total length: 23.9mm
Total height: 6.20mm