Crank Lobrazny ET1033 used to work with end heads having square drive 1/2 "Length knob -. 375 mm, the length is above average for use with face heads Therefore knob can be used to work with cars and trucks Material.. - . chrome-vanadium steel This steel is characterized by high strength and durability tool convenience knob is in the handle, which has a notch -. they slip hands during main convenience of the driver is. nd that the square is located on a movable joint. This allows, for example, working with the nuts and bolts at a certain angle to them, if you can not install the handle knob is strictly perpendicular to the bolt or nut.