From PKS

The Only Titanium Universal Track Nut! These track nuts lock into position with a set screw, setting them apart from other track nuts on the market. They were designed to be used with any foil board track and are made from 100% GR5 Titanium so corrosion will never be an issue. They are designed to work with any foil system whether it uses m6 or m8 hardware. The Track Lock Universal track Nut comes with both M6 and M8 threaded screw hole and includes both M6 and M8 set screws for locking it into place. If your Hydrofoil uses M6 Hardware, you will use the included M8; Set Screw to lock the track nut into position and then use the open m6 hole to mount your hydrofoil.

Why Titanium:

Titanium is highly valued for its high tensile strength, as well as its light weight, corrosion resistance, and ability to withstand extreme temperatures. It's as strong as steel but 50% lighter giving it a greater Strength to Weight Ratio.
Titanium is the best material to resist the corrosion performance of seawater at room temperature, and it has excellent corrosion resistance even in polluted seawater and hot seawater. The unparalleled performance of titanium in marine settings has led engineers to refer to it as "ocean metal". While other metals such as steel, copper, and brass are prone to pitting, crevice corrosion, and microbiologically influenced corrosion, titanium is unique in its resistance to the corroding effects of saltwater and the marine atmospheric environment.

Key Features:

• 100% Grade 5 Titanium
• Set it and forget it Track Nut Positioning
• Universal, works with any M6 or M8 Hydrofoil
• Corrosion free
• 50% Lighter than Steel
• Precision CNC Machined to exacting tolerances for a precise finish

Package Includes:

• 4x Titanium Track Lock T-Nuts
• 4x Titanium M6 Set Screws
• 4x Titanium M8 Set Screws