CaliburnXL Concrete Screw 19/64" x 3-1/2" T40 Star (57778) GRK Fasteners

GRK Fasteners CaliburnXL Concrete Screw 19/64" x 3-1/2" (57778) T40 Star Drive Head

Professionally engineered with a patented thread design for ease of driving the screw into concrete and similar applications:

• Pre drilling required (use a 1/4" x 5.5" concrete bit).
• CALIBURN™ Star Drive Recess: Countersinking bugle head locks wood to concrete for complete installation and effective anchoring
• CALIBURN™ XL: Washer head design for superior holding power.
• 19/64" x 3-1/2" (7.5x92mm).
• 8 threads per inch.
• T-40 Star Drive Head.
• Climatek™ Coating Code: Approved for use in treated lumber.
• Star Drive Recess: Zero stripping, with 6 points of contact.