Self Drilling Winged Plastic Anchor Direct Install Hollow Cavity Fastener for Hollow Brick and Aerated Concrete Block Product Description The Self-Drilling Winged Plastic Anchor is an innovative hollow cavity fastening solution that eliminates the need for pre-drilling in soft hollow substrates such as aerated concrete block, hollow brick, and lightweight cavity wall materials. The anchor features a self-drilling tip geometry that allows direct screw-in installation using a