GRK Fasteners CALIBURN XL 57778 Heavy-Duty Concrete Screw, 19/64 in Dia, 3-1/2 in L, 3200 lb, Steel

Caliburn™ concrete screws are professionally engineered fasteners with a patented thread design for ease of driving the screw in concrete and similar applications. Available in three different head styles for multiple applications. Caliburn™, Caliburn™ PH and Caliburn™ XL are Climatek™ coated for high corrosion resistance. Caliburn's uncompromised draw and pull-out strength make it possible to be used in jobs which previously required an anchor. The screws aggressive thread design afford it the ability to be removed and reinserted into the same pilot hole numerous times without the concern of the fastener breaking or the threads wearing.

• Star drive eliminates stripping for improved productivity

• Heavy-duty threads lock into concrete and can be removed and reinserted without screw damage

• Countersinking bugle head locks wood to concrete for complete installation and effective anchoring

• Climatek™ coating is AC257 code approved for use in treated lumber

• Caliburn™ XL washer head design for superior holding power