10 x 1/2 Tamper Resistant Drilled Spanner Flat Head Sheet Metal Screw 18-8 Stainless Steel

10 x 1/2 Tamper Resistant Drilled Spanner Flat Head Sheet Metal Screw 18-8 Stainless Steel . Tamper resistant self tapping/sheet metal screws provide an additional layer of security by their drive design, which prevents their removal with ordinary screw drivers or insert bits. These self tapping/sheet metal screws conform to ANSI/ASME B18.6.4.