M12 Knurled body countersunk head blind rivet nut - T304 (A2) Stainless 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 16 mm Body Diameter: 15.9 mm Head Diameter: 19 mm Head Thickness: 2 mm Overall Length: 24.5 mm Material Finish T304 (A2) Stainless Steel