This socket set has 30 pieces including fractional and metric deep length sockets, two flip sockets and one extension, all neatly packages in a molded storage case for organization and convenience, The modeled case with handle allows easy storage and convenience while working, The cover of the case can be removed, so the bottom can be used as a tool box organizer, The sockets are made from high quality alloy (chrome-molybdenum), They are heat treated to provide the correct balance of strength and durability, The impact socket"s ""high torque"" drive provides increased strength through the transfer of pressure from the thinnest part of the socket wall toward the thicker section, The sockets feature 20 percent more torque than on standard hex impact sockets, There is an increase to tight areas through pressure shift to reduce the socket wall thickness, There is a reduced wear and chance of rounding off fasteners by the grip the sockets provide on the fastener across a broader contact area, Flip sockets and extension provide wheel service, Socket Drive Size: 1/2 Inch, System of Measurement Fractional, Metric, Number of Sockets in Set 27, Socket Size:s Included 7/16"", 1/2"", 9/16"", 5/8"", 11/16"", 3/4"", 13/16"", 7/8"", 15/16"", 1"", 1-1/16"", 1-1/8"", 1-1/4"", 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 21mm, 22mm, 26mm, 27mm, SKU: EGLT20298