Iron Trapdoor

Iron Trapdoors are blocks that will be added in Update 0.13.0. They serve as a type of barrier-door than can be placed on the floor. They can only be opened by a redstone signal.

Crafting

 * 4 Iron Ingots => 1 Iron Trapdoor

USES
Iron Trapdoors can be used as barriers to underground pits or structures. They serve as more sturdy and safe barriers, since they can only be activated through a redstone signal. This can be used to trap mobs (and players) into certain areas underground.

trivia

 * Iron Trapdoors are also considered as solid blocks by mobs, and therefore can be similarly used as a component in automatic mob farms.