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The following section contains information from a previous version of StarCraft II: Heart of the Swarm which is no longer valid.
The shredder was a mobile unit produced from the factory.
It could create a whirlwind of radioactive death around it. It dealt roughly 20 DPS to both ground and air units, but didn't affect units on different elevations.
The shredder began its life as a "napkin concept"—a term for low-detail concept art, with most of the actual design left to unit modelers. An early concept had it being structurally similar to spider mines.
The shredder was cut from multiplayer by April 2012. Testing showed it confused players; the unit was being used for quickly killing workers rather than for its intended purpose of map control.
Additionally, its role overlapped with that of the siege tank.