12 x 1 1/2 Tamper Resistant One Way Round Head Sheet Metal Screw Zinc

12 x 1 1/2 Tamper Resistant One Way Round Head Sheet Metal Screw Zinc . 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.