Ankerbolt is a Self Tapping Anchor. Hexagon Flange Head Grade 8.8 Zinc Plated Clear Passivated. For use in a variety of base materials. The self tapping action provides a positive anchorage in concrete, brick, stone and hollow materials. Drill hole size 6mm. Anchor length 50mm. Maximum fixture thickness 20mm. Minimum hole depth 40mm. Driver type 10mm A/F.