Expansion anchor bolts are made entirely of steel elements. Designed to fix fire collars Piro Collar PC to massive partitions - concrete, reinforced concrete, they are not suitable for flexible partitions made of plasterboards. Steel expansion anchor bolts are installed in a pre-drilled hole in the partition. After inserting the expansion anchor bolts into the hole and light impact from the front, the anchor wedges in the hole, which allows the nut to be screwed on and fire collar fixed. The number of expansion anchor bolts needed to fix the fire collars corresponds to the number of fasteners. Expansion anchor bolts are delivered on an individual order - they are not part of the set with a fire collar. Expansion anchor bolts are packed in collective packages of 10 pieces in one package.