FH-M2.5-6 FH-M2.5-8 round studs 1.Standard:PEM 2.Attestation:ISO9001 3.Material:steel 4.Sizes:#2 to 5 16 or M2.5 to M6 Which use the proven self-cliching design,install with a squeeze in punched or drilled round holes and become permanently mounted in the thin sheet;Thread sizes#3 to #3 8'' and M3 to M10.