Concrete Screwbolt is a non-expansion bolt with undercut technology for fixing into wood,brick, cracked or no-n cracked concrete and it is a high performance bolt that cuts its own thread. Non expansion bolt that can be used close to the edge where conventional expanding bolts will damage the material. Field of Application: It suits to perimeter fixings, to some details of Fire -resistant partition and it is specific for head of wall connections. Concrete (non- cracked), brick, Pre-cast hollow concrete. Beams, wood. Head of Wall Connections Fire-resistant Perimeter Fixings Other Areas (Curtain walling, Barriers, Balustrading, Handrails, Racking and Sole plates).