Size:17mmProduct description17MM CRFT WR (NON-RAT)From the ManufacturerGearWrench 81621 17 millimeter crowfoot non-ratcheting wrench for use in very tight places where a standard open end wrench cannot reach. Has 3/8-Inch square female drive for use with standard attachments. Tool is made with Chrome Vanadium tool steel for strength, and has a high polish nickel chrome finish for long tool life.