Head shape: lens head. Material: A4 stainless steel. Pickled and passivated. Suitable for cracked and non-cracked concrete. Small centre and edge distances. High loads. Application: cable ducts, suspensions, fittings, perforated rails in outdoor areas. Area of use: electrical installations, sanitary facilities, commercial buildings, stainless steel fastenings. ETA-15/0514 and ETA-16/0123.Screws can be used to fasten products to ensure functional integrity.