Stainless steel internal thread with integrated expansion segment for flush surface mountings. All anchors can also be used with threaded rods. Approved for sprinkler systems from size ≥ M8. The fastening can be loosened and tightened without releasing the anchor. Simple and secure installation with the adjustment tool. Small drill diameter and short anchorage depth. Fire resistance class R120. Approved by building authorities. High holding values. The drilling depth must be observed. The screw length must be determined according to the minimum embedment depth and the thickness of the fixture. Impact A4 stainless steel can be used in dry interiors, humid interiors, outdoors, including industrial atmospheres and marine environments. Suitable for use as multiple fixings for non-load-bearing systems in cracked and non-cracked concrete. For spacer assemblies in combination with threaded rods. Pre-adjustment assembly. For professional installation, use the adjustment tool from Impact Tools.