These Screw Bolts (pack of 6):
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We recommend sex bolts when installing panic bars on non-solid metal doors. The female sex bolt has a knurled barrel that holds steady so that the male sex bolt can secure from the other side. Male sex bolts require Phillip’s flathead screwdriver for installation use. These sex bolts provide a measure of security as there is no way to loosen the sex bolts from the female side of the set. The price includes six units that consist of a pair of one female sex bolt and one male sex bolt.