The Redlam Panic Bolt originally used a glass tube which was designed to be smashed in the event of a person needing to access the emergency exit door.  The glass tubes for the panic bolt assemblies are no longer available due to health and safety reasons.  The new replacement tube that should be used in the Redlam Panic Bolt is the Ceramtubes.
Panic Bolts - Replacement Redlam Panic Bolt Tubes

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These replacement bolts are available in single tubes or in boxes of 20.  They are easy to install in the redlam panic bolt assembly.

If you're interested in these products you may also be interested in our Redlam Panic Bolt MK1 and Redlam Panic Bolt MK2.