Spikes doors were introduced in "The Market" update. Door spikes have the features of both doors and spikes, which means that they do damage on contact and can be opened at the same time. Their main disadvantage is that they deal half the damage that normal spikes would deal and have very little health compared to other structures. It also is harder and takes more time to craft.
The first Door Spike upgrade, it deals 5 damage to players on contact. Wooden Door Spikes are very weak, having less durability than a Campfire. It also deals a meager 5 damage. Because of this, it is not recommended to use these on a base.
Third upgrade, crafted with a gold door. It deals good damage (15) and is like a door at the same time, and can be toggled open or closed.
Fourth upgrade, greater health and damage (20). It could fit very well in a base, and can be found in advanced bases.
Amethyst Door Spikes are the last tier of Door Spikes. They have a lot more health (2 times the diamond tier) and they have the best damage out of all Door Spikes (25), a bit more than the damage a Diamond Sword does. They can be found in very advanced bases.
Reidite Door Spike
about the strongest door spike deal 30 damages and has a very high durability