Mechanical anchors in galvanized steel with metal clamp and expansion cone ETA-certified option 7 for non-cracked concrete C20 / 25 - C50 / 60. Suitable for anchoring in heavy carpentry, plant engineering, construction, laying of stairs and railings. Features: - European technical approvement - Thread diameter equal to drilling diameter - Head reinforced to avoid damaging the thread during installation - Special shape expansion bush to make the expansion soft and progressive - Ensures high load values and rapid installation even without moving the object to be fixed Support materials Approved for non-cracked concrete with strength class from C20/25 to C50/60. Also suitable for non-cracked concrete with strength class C12/15 and compact natural stone.