I stored a lot of tools under the work table of 1 m × 2 m, and it was heavy if it was a W caster up to now and it was hard to roll on the floor and the rubber mark of the tire remained on the floor But, changing to this product, it began to move lightly like a lie. Since the caster is low floor, the height of the work table does not change, so it is now easier to change direction. To the contrary, it moves so much that you have to think about fixing method.