This is the next best thing to a real wrench! Made from 420 stainless steel hardened to Rc52, it's 1/8" thick, 4" long and 1" wide (3.2 thick x 100 long x 25mm wide). It will tighten or remove nuts from 3/16" to 11/16" or 5mm to 17mm. Excels at preventing nuts from spinning as you tighten a bolt. One end is tapered for use as a pry or a screwdriver. There are also imperial and metric scales. One of the best features of this tool is the 1/4" hex hole which allows you to slip the wrench over a standard hex bit (not included), creating a lever for applying extra torque. A wonderfully useful tool. Made in the USA.