The Sea To Summit Alpha Cutlery Set - 3 Piece uses a durable aluminum which is hard anodized to add strength. This hardened shell also encapsulates the aluminum, to eliminate the risk of the alloy leaching into food. The Knife, Fork and Spoon of the Alpha Set all have a hexagonal hole (3mm, 4mm or 5mm) in the handle which can be used as a wrench for stove repair.