A bolt that is composed of the bolt, a hanger and a nut. The bolt is placed in a pre-drilled hole. The hanger and the bolt is held in place by tightening a nut on the outside part which expands the inside of the bolt against the rock face.
A bolt that is composed of the bolt, a hanger and a nut. The bolt is placed in a pre-drilled hole. The hanger and the bolt is held in place by tightening a nut on the outside part which expands the inside of the bolt against the rock face.