Girard Police are investigating a theft of about $4,000 worth of brass plates and cylinders from Trinity Highway Products.
According to police, sometime between Wednesday afternoon and Thursday morning, someone took 500 pounds of brass items from the plant’s machine shop and tool room.
Trinity, on North State Street, is a manufacturer of highway guardrails.
Scrapping for brass and other metal has become a large industry, said Girard Police Chief Jeff Palmer.
Palmer said brass thefts have become more common in recent years because precious metals have increased in value.