• Concrete Flat Washer Head Screw
• Caliburn™ screws are professionally engineered fasteners for concrete and similar applications. They feature a patented thread design for ease of driving the screw. They are available in different head designs for multiple applications with the recommended GRK™ Drill Bits. Caliburn™, Caliburn™ PH and Caliburn™ XL are Climatek™ coated for high corrosion resistance
• Features: Star Drive Recess, Complete and Effective Installation, Case Hardened Steel