This trend set of mini hex key set includes both metric and imperial sizes the metric hex keys range from 07mm to 3mm and the imperial sizes from 0028 inch to 964 inch af the keys are made from chrome vanadium steel providing strength and durability making them ideal for router cutters modellers engineers automotive diy and electronics supplied in a handy plastic holder which is labelled for easy size identification the hkseta mini hex key set comprises the following sizes metric 07mm 09mm 13mm