Sherex by PEM's countersunk, knurled full metric rivet nuts are perfect for all applications. When installed, countersunk rivet nuts are flush to the base material, giving an asthetic many manufacurers and assemblers desire. The knurls help resist the rivet nut from spinning in the hole under higher torque and clamp load instances. Closed end will eliminate dust and liquid from entering through the threads of the rivet nut.