Flat Head,Knurled Body, Open End Rivet Nut by Cold forging.Size:M3-M12, UNC8/32-1/2.Material:Steel, Stainless Steel, Aluminium.. Head Type: flat head/ thin head/countersunk headBody Type: circular body/knurled body/full-hex body/half-hex body/ open-end/ closed-endSize: Metric thread: M3~M12 Inch Thread: UNC6-32~1/2-13Material: steel, aluminium, stainless steel, brassPlating: Yellow Zinc Plating, ...