Simpson 1 4" x 6" Strong Drive SDS Heavy Duty Connector Screw SDS25600 Direct Fastening Proprietary flute geometry reduces Proprietary flute geometry reduces vibration and optimizes impact energy transfer from the rotary hammer into the drill bit tip 2 Flute (HW) Carbide Cutting Edges hard carbide material (HW) holds a sharp edge longer through demanding cuts in hardwood and composite sheet materials Double Barrier Coating provides corrosion resistance that helps extend the service life of the fastener in demanding structural and outdoor applications this heavy duty connector screw saves time on the job site while maintaining the structural integrity required for load bearing connections