Description Can be installed on the inside or outside to hold shutters closed. Typically installed with 1/4″ carriage bolts (not included) that go through the shutter and through the locking bar. Secure the carriage bolts with a nut or wing nut. This provides security and will not rattle in the wind. Can be used in addition to our shutter slide bolts for extra storm protection. Powder coated for long life.