Brass T-nut inserts and countersunk bolts to mount Hydrofoils on the Happy pill Foil board and Rocket Foil board from Liquid Force. Includes 4 brass T-nuts and 4 stainless M8x30mm flat head bolts Note...if you're mounting the foil fish you will need pan head M8 bolts, which we have and can include for you just make sure you tell us in the "order information" section with your order.