Faithfull FAIHK316 Hexagon Key 3/16in A/F Faithfull Professional quality hexagon keys made from fully hardened chrome vanadium steel. All keys from 4mm (5/32in) have chamfered edges to prevent damage to blade and fittings. All keys 3mm (1/8in) and above are marked with their size. Size. 3/16in.A/F
