Betonschrauben Window Frame anchors / Concrete screws Picture enclosed Pan Head (Cylinder) Head dia Ø7.5mm Hi-Low Thread 3 Flutes on thread Torx-25 recess Steel hardened zinc-plated 7.5x112 – 25.000 pcs. 7.5x152 – 20.000 pcs. 7.5x182 – 10.000 pcs.