10 qty brass or stainless T-nuts for your tracked hydrofoil. These are salt water approved and perfect for all Liquid Force, Lift, Slingshot, FoilMount (stainless only), etc track systems. They are M8 standard metric threads which is the convention for all hydrofoil tracks. These t-nuts will work in windsurfing mast tracks as well as any standard track system made for hydrofoils. These are metric t-nuts that accommodate 8mm diameter bolts in size with a normal thread pitch of 1.25mm.