Also called Cross Dowel. Barrel Nuts as a replacement for your tuttle, deep tuttle or power box fins. Our barrel nuts is the large size; Diameter Ø12mm, length 12mm, and as normal; threads M6. Both sides is plain (no slotted). Material is Brass, which is a tribological more robust alternative than stainless steel nuts, when paired with stainless steel screws in marine environment. Also perfect if you need to replace a smaller Ø10 barrel nut with gone threads (then you need to drill a Ø12 hole).