A reverse-thread sheet metal screw that installs counter-clockwise, thus tightening if removal is attempted. Type A sheet metal thread forming screw with a locating point.
 
                Tamperproof Screw Company
#8A x 1/2" Opsit Left-Handed Truss Head Security Screw, 18-8 Stainless Steel (100/Pkg…
    
        
    
    
        $25.09
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