Simpson #8 x 2 1 4" Square Drive, Self Drilling Fiber Cement Screw, 410 Stainless Steel PACK:2500 Pk reducing vibration and deflection during reducing vibration and deflection during profiling cuts for smoother results and greater cutting accuracy it is manufactured to the highest quality standards and engineered and tested to perform in demanding residential and commercial structural framing projects finished appearance Type 410 stainless steel combines hardenability with corrosion resistance making it suitable for both the penetration demands of steel framing and the weathering exposure typical of exterior fiber cement siding applications