GRK Caliburn Concrete Fasteners are the finest fasteners available.

GRK Caliburn Concrete fasteners are professionally engineered 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. Anchors may only be used for redundant applications, where multiple anchors support linear elements (e.g. ductwork) when designed. The aggressive thread pattern creates a track that burrows into concrete and is designed for trapping excessive concrete dust thus keeping the threads sharp. They feature a patented thread design for ease of driving the screw. The GRK Caliburn Concrete Fastener is Climatek coated for high corrosion resistance.