This is the next best thing to a real wrench! By Burktek, this appears to be a discontinued item. Reviews are good, people seem to like them. Made from 420 stainless steel hardened to Rc52, 1/8" thick, 4" long, and 1" wide — perfect for a pocket or tool pouch. 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 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 USA.