Heavy Gauge Round Steel Road Stars 4 Pc Set. These road stars are designed for use in securing private property and law enforcement applications in which an immediate vehicle disabling roadblock is required. Each star has four 2" long 5/16" guage spikes with .3" razor edges. Assembled with class four tip industrial grade welds. Made of hardened round steel. Includes poster declaring "PRIVATE PROPERTY-NO TRESPASSING", and notification that severe tire damage can result from doing so.