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
#10A x 1" Opsit Left-Handed Truss Head Security Screw, 18-8 Stainless Steel (100/Pkg.…
    
        
    
    
        $29.27
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