GRK Caliburn XL Concrete Screws

The GRK Caliburn XL Concrete Screws are professionally engineered fasteners for concrete and similar applications to resist static, wind and seismic, tension and shear loads in cracked and uncracked normal-weight concrete and sand- lightweight concrete.They have an aggressive thread pattern which creates a track that burrows into the concrete and is designed for trapping excessive concrete dust, keeping the edges sharp and crisp. Using these fasteners requires pre-drilling a 1/4in. pilot hole with a GRK Concrete Bit for Caliburn XL screws, clearing concrete dust from the hole, and driving the screw with a GRK #40 bit. Caliburn XL is coated for high corrosion resistance and is great for concrete and masonry applications.