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The 2" solid steel axle weighs 73lbs empty.
A barbell or dumbbell having a handle 2" in diameter or greater is considered a thick bar. These bars are typically smooth and are most often seen with 2" or 2.5" diameter handles. Training with a thick bar in the place of a normal bar places a large amount of stress on the supporting strength of the hands. This is the result of four factors:
Avoid the temptation to perform all exercises in a workout with thick bars. While the grip will be trained extensively, work for the rest of the body will be lacking. Due to the non-revolving weight sleeves, certain ballistic movements (such as cleans), may be too hard on the wrists for regular thick bar training.