Extra brass T-nuts for your tracked hydrofoil sold each.  These are salt water approved and perfect for all track systems.  They are M8 standard metric threads which is the convention for most hydrofoil tracks.  These are sold per each.  

If you have a bulk order contact us at sales@foilmount.com

Measurements: 
15mm width
19mm length
8.5mm height
8.6mm width of center section with threads
3.95mm height from bottom of step