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Smooth bearings limit assistance from the wrist.
The most common exercise done on a rolling handle is a one handed deadlift. Weight is added to a loading pin on the ground, which is then attached to the bottom of the handle. The lifter straddles the weight and lifts the handle with one hand. The thumb must be on the opposite side of the handle as the fingers, preventing the use of wrist flexion to cheat the lift. Few men will break the 200lbs from the ground in this fashion.
Ironmind popularized the lift with their Rolling Thunder handle, a 2.375 inch PVC sleeved implement. Rolling Thunder deadlift contests are held throughout the world, usually coinciding with strongman competitions. The world record is quickly approaching 300lbs, with a cash prize for first person reach the milestone.