5/16-18 x 3" Security Machine Screw - Round One-Way Head - Steel - Zinc - FT - UNC - USA - 100 Pk

Security fasteners provide an added level of security by their drive design that prevents removal with ordinary screw drivers. Maximum torque transfer & positive tool engagement means easier drive installation with less pressure & slippage. Requires matching driver bit.

Round Head screws are widely used for general purposes, featuring a high crown with a deep recess and smaller diameter head than truss or pan heads.