12 point design means less wear on fasteners. CR-Mo Alloy Steel for Long life. Packaged in a heavy duty blow mold case. Fully guaranteed Includes: Standard: 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 26mm, 27mm, 30mm; Deep: 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 26mm, 27mm, 30mm 1/2" drive U Joint.