... : din933,din931size of the product: all sizesurface of the product: yellow zinc plated , zinc plated , black , plain , H.G.Dpacking of the product: bulk ... stainless steel, aluminum, brass or other special materials. For finishing, we provide black oxide, zinc electroplating, phosphate, copper plating, mechanical galvanization, hot ... you are welcomed to visit us. hexagon bolt DIN933 yellow zinc plated