CTA Tools 2497   8-In-1 Transfer Case With Differential Plug Wrench Sizes: Male Square - 8mm, 10mm, 3/8-Inch, 1/2-Inch Male Hex - 10, 21, 14, 17mm These wrenches offer 16 different socket sizes to fit most Oil Drain, Transfer Case and Differential Plugs Features offset head design with heavy-duty yoke support to withstand high torque applications Superior indexing feature locks socket into working position Smooth handle with nickel plate for easy maintenance and durability; heavy-duty magnet built into handle