1. Pickup all spikes from the ends not the side, and yes, I did have to make this #1 x.x

2. As with the other commenters, it blocks a lot of creatures from passing it. In particular, the gaps created under behemoth gates & etc.

3. They snap together like fence foundations & can be connected to several things.

4. On pve, they don't seem to hurt your dinos unless you're involved.