GRK Caliburn 19/64 In. x 3-1/2 In. Star-Drive XL Concrete Screws (400 Ct.)

GRK Caliburn Concrete Screws are professionally engineered fasteners with a patented thread design for ease of driving into concrete and similar applications.

• Recessed Star drive affords zero stripping with 6 points of contact.
• Aggressive Heavy Duty Threads lock ino concrete and can be removed/reinserted without screw damage.
• Climatek coating is AC257 Code-Approved for use in treated lumber
• Ideal for use in anchoring to concrete or wood to concrete applications including basement framing and sheds