Ankerbolt is a Hexagon Head Grade 8.8 Self Tapping Anchor. 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 16mm. Anchor length 150mm. Maximum fixture thickness 70mm. Minimum hole depth 112mm. Driver type 27mm A/F.