The Nail, is one of the materials that you will need to repair and re-operate the buildings around your junkyard business. Also, Nail, is one of the materials that you will use while repairing junk vehicles. You will need this material to repair cars, tractors, trucks and hero cars. With repairs, you can increase profit margin of you junkyard business. You can get this material by dismantling junk vehicles. Also, you can produce Nails by combining other materials, at the Recycling Factory.