Hexagon socket head cap screws 1. material:alloy steel , carbon steel 2.finish:balck, zinc plated, yellow zinc plated, plain Hexagon socket head cap screws 1. material:alloy steel , carbon steel , brass , stainless ,2.Grade:8.8\10.9\12.9\4.83.finish:balck , zinc plated , yellow zinc plated , plain ,4.packing : bulk in carton , box packing , specail quaitity packing available ,we also can produce ...