What size lug nut is on a 2006 Chevy cobalt I lost the lug wrench and need a replacement?

The lug nut size on a 2006 Chevy Cobalt is typically 12mm x 1.5. You will need a lug wrench or socket that fits this size to replace your lost one. It's a good idea to double-check with your vehicle's manual or a local auto parts store for confirmation if needed.