Penetrate the hardest wood products with ease. Unique 4-corner thread form with raised-ridge technology greatly reduces driving torque. 0.230" diameter casing-style head and slender #7 diameter for finish work and trim. 6-lobe drive prevents driver bit cam-out and stripping in recess. Pre-drilling recommended near board ends to prevent splitting. Threaded approximately 2 ? 3 up the shank to tightly draw the decking to the substrate . Choose type 316 stainless steel for superior corrosion resistance. 6-lobe driver bit included in both Contractor Packs and Deck Packs.Simpson Strong Tie Co., Inc.