Shockarachnids resemble largely oversized spiders with eight red eyes, eight claw-tipped jointed legs and a large abdominal section. They have a pair of fangs that are able to protrude from their "mouths" and emit a highly-charged current of red electricity that can be applied to a selected target. Their abdomens also have a built-in steel spool producer presumably hidden in the very tip.
A larger version of the Shockarachnids, most likely the leader appeared in "Diamond Bit".
Shockarachnids use their electrical bites to cause other mechanical creatures, namely Trux and Tools alike to malfunction; they also produce a type of web possibly made out of flexible steel fibers capable of being used in construction during builds. The metallic silk also exudes a strong magnetic field that can trap other living organisms made out of metal and make getting out of a web next-to-nigh-impossible.