5/16"x2.5" 1WayBolt/BreakAwayNut Theftproof/Set12

One Way Bolt with Break Away Nut, a set of 12ea.  Theft Proof. 

5/16”x2.5" zinc plated steel one way bolts. Bolt head is cut away for one way tightening with straight edge screwdriver.  The kit includes 12ea. sets of hardware to install twelve traffic signs