... type: knurled Material: carbon steel Stable quality and fast delivery Strict QA Check Large Flange Head Knurled Body Rivet Nut, Steel, Zinc ... nuts Basic Product Information:1.Material:carbon steel, aluminium, stainless steel 2.Finish:Zinc Blue,Zinc Yellow,Zinc Clear, Nickel Flash3.Head ... be widely used in the industries such as air condition, car, high-speed rail or light rail coach, elevator, switch, ...