Steel sleeve anchor with two expansion zones. Substrate: - unscratched concrete with class B15 or higher. Advantages - properties: - most sizes available in a version with two expansion zones, - a wide range of available diameters and lengths, - knurling on the expansion cone to facilitate wedging the anchor into the hole, - a flat notch on the anchor pin, allowing manual pre-anchoring, - an anchor particularly useful for anchoring very thick elements. Material: - electro-galvanized steel, anti-corrosion layer thickness min. 5μm.