... ,Aluminum. 2.Size:M3-M12 3.Surface:black.zinc plated RIVET NUTS1, Material: SCM435.40CR.A3.SUS3042, Size: M3-M123.Head ... type: Flat head, flat hexagon head,small countersunk head4, Surface: plain, black oxide, zinc plated, hot dip ... produced by customers' requirements.8.According to your detailed drawing. Rivet Nuts