5/16-18 x 2 1/2 Tamper Resistant One Way Round Head Machine Screw Zinc
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5/16-18 x 2 1/2 Tamper Resistant One Way Round Head Machine Screw Zinc.Tamper resistant machine screws provide an additional layer of security by their drive design, which prevents their removal with ordinary screw drivers or insert bits. These machine screws conform to ANSI/ASME B18.6.3.