Caliburn screws are professionally engineered fasteners for concrete and similar applications. They feature a patented thread design for ease of driving the screw. The Caliburn XL are Climatek coated for high corrosion resistance. They are designs for multiple applications with the recommended GRK Drill Bits.

Features:
- Star Drive Recess
- Complete and Effective Installation
- Case Hardened Steel

To Use:
- Pre-drill pilot hole with 1/4 GRK Concrete Drill Bit for Caliburn XL screws.
- Clear concrete dust from hole.
- Drive the screw with GRK #40 bit for Caliburn XL screws.