Impact Nut Extractor and Driver Measurement System Metric Fastening Size 5/16 in 8 mm Tool Insertion Size 1/4 in Hex Overall Length 2 9/16 in Impact Rated Yes Magnetized Tip No Finish Black Oxide Material Chrome Molybdenum Alloy Steel Slide to Clean No Number of Nutsetters Included 1 Tool Brand GEARWRENCH