60% Vespel / 40% Graphite ferrules have an upper temperature limit of 400 deg. C. Ferrule is for standard 1/8 in. Swagelok / Parker type fittings. 0.5 mm ID fits 0.32 mm ID capillary columns. One piece design requires no back ferrule. Packaged: 2-3/8 in. x 1-1/4 in. x 1/2 in. Plastic Hinged Box; Weight: 8.5 g.