Its life cycle can take from 4-8 years to complete. Most of it spent underground as a larvae known as the wireworm. I found two completely different ideas about the usefulness of the larvae. Several sites mention the destructiveness of the wireworm to crops. Others mention that the wireworm as a voracious predator of wood boring beetle larvae. In other words, they are good guys. No site mentions both ideas. Hmmm?
It doesn't look so big in the first picture, but the second picture gives you the true size. At least my nail is clean(ish). I'm not a big fan getting this near large insects, but I know that this one is harmless. Lee brought one in the house the other night. On his hand.