This is a 6-piece combination wrench set made by SATA, designed for use with Standard (SAE) measurements. The set includes wrenches with sizes of 5/8", 9/16", 1/2", 7/16", 3/8", and 5/16". The wrenches are made of alloy steel and have a polished chrome finish. They are non-ratcheting and have a 15 degree offset on the box end. New with wrench rack for storage. Please check out my other items and thanks for looking.