The countersunk head version of the Hollo-Bolt is suitable for hollow sections or conventional steelwork where access is available from one side only.
It also ensures that the fixing protrusion from the steelwork is kept to a minimum whilst still using a plain drilled hole in the supporting section and the outer plate / bracket.
The Flush Fit version of the Hollo-Bolt, the original expansion bolt for structural steel.
The Flush Fit version merges the technical advantages of the distinguished Hollo-Bolt with the aesthetic benefits of a discreet fixing and is suitable for hollow sections or conventional steelwork where access is available from one side only.