Stainless Steel Rivet Nut,Countersunk Head,Knurled Body, Open End.From M4-M12. Type: flat head/ thin head/countersunk head 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, RoHS,Black Zinc Plating and Zn-Zi platingSIZEd eh(ref.) D-0.03-0. ...