Mag Hub Nails are magnetized for easy detection and zinc plated to resist corrosion
Features a large center point and looks like a standard survey marker
Not made to be driven into asphalt or concrete
Easy to carry 
Lengths: 1/4" x 6" or 3/16" x 4"
Approx. hub nails per box: 6" = 362 hub nails, 4" = 885 hub nails