Expansion anchor bolts are made entirely of steel elements. Designed to fix the CarboCollar CC fireproof collars for 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 fireproof collar fixed. The number of expansion anchor bolts needed to fix the fireproof collars is given in the Carboline catalog (the number of expansion anchor bolts corresponds to the number of fasteners). Expansion anchor bolts are delivered on an individual order - they are not part of the set with a fireproof collar. Expansion anchor bolts are packed in collective packages of 10 pieces in one package.