An anchor insertion rod is disclosed for use with an anchor insertion tool removable secured therein for the installation and setting of anchors. The first wall comprises two jackets of composite material disposed on either side of an intermediate arrangement and further includes at least one soleplate enabling it to be secured to the second wall. The adjusting device also includes an eccentric arranged on and rotatable about the axis of rotation and a plurality of first rotating members arranged concentrically about the eccentric.