The Iron Fence is a block added by IndustrialCraft. It can serve as a more decorative version of the normal fence, but its primary function is to replace the function of ladders. Iron Fences can be stacked on top of one another, and if a player approaches the resulting pole while holding the Crouch button, he will quickly slide down the pole, much faster than down a ladder, but still not fast enough to receive fall damage upon touching the ground.
Furthermore, if powered by a Magnetizer, the Iron Fence can serve as a type of elevator, quickly propelling upwards any players with Magnetic Boots equipped who approach it, up to 20 tiles away from a Magnetizer. Magnetic Boots include Iron, Gold, Nano, and Quantum boots.