Big Timber B# 9 x 3-1/8" Bronze Robertson® Flat Head 1.8/Box

• Heat-treated hardened steel for high tensile strength and high shear strength • Triple Layer ACQ Compatible Bronze Coating for Exterior or Interior use • Deep Robertson® Drive Recess reduces cam-out end load • Handles maximum torque with The Original Robertson® Drive • Self countersinking nibs under the head to ensure a clean finish • Aggressive knurl enlarges hole to reduce splitting and drag to help draw lumber together • Patented Aster® thread form on threads to cut fibers for easier engagement at lower torque • Type-17 tip for faster precise starts which eliminate “walking” - Provides easier insertion without pre-drilling • Aggressive thread for great withdrawal strength • Structural Wood Screw - Backed by certified independent testing (TER 1911-01) • International Building Code and International Residential Code Compliant