M10 Knurled body countersunk head blind rivet nut - Zinc Plated Mild Steel The countersunk head style provides a stronger head and will install flush in a countersunk hole Grip Range: 2.0-4.5 mm Hole Diameter +0.1 / -0.0: 13 mm Body Diameter: 12.9 mm Head Diameter: 15.5 mm Head Thickness: 1.8 mm Overall Length: 21 mm Material Finish Zinc Plated Mild Steel