Hook Valheim 1.0.20
Hook is a material found in the Mistlands biome in Valheim. It is used to craft Grappling Hook.
“A finely wrought item, with a gripping potential.”
Hook is a crafting material. The game describes it as "A finely wrought item, with a gripping potential." Each one weighs 5, and you can carry up to 50 in a single stack. It can be teleported, so you don't have to leave it behind when you use a portal.
Hook has one listed use: it is an ingredient in the Grappling Hook.
Used to craft
Other material items
Acorns, 
Amber, 
Amber Pearl, 
Ancient Bark, 
Ancient Coin, 
Ancient Metal, 
Ashlands Gourmet Bowl, 
Ashwood, 
Asksvin Bladder, 
Asksvin Hide, 
Asksvin Neck, 
Asksvin Pelvis.