1” screw in bushings are used to insulate the sharp cut edge of flexible metal conduit so wires passing through the raceway will not be damaged. Garvin Industries’ screw in bushings allow trouble free installation of low voltage fire alarm, security and data cables in flexible metal conduits. Cables exit the raceway without damage from sharp edges when termination of the devices is required in the field. The bushings are zinc electroplated for excellent corrosion protection.