To erect heavy tents on hard surfaces is often difficult with the significantly wider pegs supplied. With the Nordisk Steel Nail you get better access to firm ground and can anchor your tent securely, as the pegs are particularly narrow but also very stable. You use a hammer or a stone to sink it into the ground.
At the upper end, the 4 steel nails have an extra hook and a small hole. The hook ensures that the guy rope does not slip away. A second nail can be inserted through the hole to make it easier to pull it out of hard earth. The hole is also intended to knot the guy rope.