Professional quality imperial hexagon keys made from fully hardened chrome vanadium steel.All keys from 5/32in have chamfered edges to prevent damage to blade and fittings.All keys 1/8in and above are marked with their size. Features: Professional quality AF imperial sizes AF imperial sizes Key sizes over 5/32 in have chamfered edges for a better fit into the fixing Key sizes over 1/8 in are marked with their size Specifications: Dimensions: H:18.4 x W:1.9 x D:5.3 cm Colour: Black Guarantee:5 years Material: Metal Model Number: FAIHK34