6 Primarily metal injection anchors for building purposes, namely, pretensioning anchors, ground anchors, facade anchors, corbel anchors, stitching anchors, wall ties and hollow wall anchors; anchor corpus composed primarily of metal, mild steel, stainless steel and special steel, equipped with woven or knitted sleeves composed of natural or plastic materials, namely, natural wool, a mixture of wool and plastic fibers or pure plastic fibers, glass fibers or steel fibers, completely or partially filled with mineral grouts