The crafting could just be the usual 6 stakes + a cutting tool + typing equipment (for balancing).
Spiky fences would be perfect for home defence. They could serve as traps as well (unwitting animals impale themselves on the fence while trying to climb over)?
The crafting could just be the usual 6 stakes + a cutting tool + typing equipment (for balancing). It would also take longer to build.
In order to access the other side of a spiky fence, you need to build a fence gate onto an existing fence. This gate can be opened and closed like a door.
Bears can still break through, so it isn't impenetrable.