Simpson #9 x 1-1/4 in. Collated Fiber-Cement Board Screw High-Low Thread C-3 Galv 1500-Pk Carbide Saw Blades 5/16" x 1" Upcut Spiral

5/16" x 1" Upcut Spiral Bit (1/2" shank)

Upcut spiral bits eject chips upward for efficient chip evacuation in deep slots and pockets

Wood deck post-to-beam connections

Heavy-gauge 7 ga

Simpson #9 x 1-1/4 in. Collated Fiber-Cement Board Screw High-Low Thread C-3 Galv 1500-Pk Carbide Saw Blades 5/16" x 1" Upcut SpiralSimpson CB3BLGHL Fiber Cement Board Screw (Collated) #9 x 1 1 4 in., #3 Square Drive, C 3 Mechanically Galvanized, 1,500 Quantity by Simpson is engineered specifically for cement board to wood applications involving coarse, porous, and softer materials. This collated screw is designed for use with the Quik Drive PROLDHG2 underlayment backerboard system, delivering a clean, concealed finish through its countersinking design making it a reliable choice