Countersunk rivet nut.Features:1,for use in soft metric hole sizes;2,high corrosion resistance;3,completely flush installation. We can supply you full completed series.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, brassKey ...