1/4" Ferrule 0.5 mm ID 60% Vespel / 40% Graphite (10/pk)

60% Vespel / 40% Graphite ferrules have an upper temperature limit of 400 deg. C. Ferrule is for standard 1/4 in. Swagelok / Parker type fittings. 0.5 mm ID fits 0.32 mm ID capillary columns. One piece design requires no back ferrule.