Powerbuilt 330-Lbs Capacity Low-Back Padded Rolling Shop Seat with Lumbar Support is constructed of an all steel square tube base frame for stability and durability. The steel base frame has a square foot rest bar and mesh wire racking for storing tools and other larger items. This rolling seat uses a gas shock raiser post which offers height sustainability from 19.5" to 25". The rolling seat height is lower to the ground for comfort when working on maintenance jobs in the garage, around the house or in the garden. 4pc rubberized caster wheels leave no marks on tile and wood floors and roll smoothly across any hard surface. The lower lumbar "Low-Back" rest design adds support for the hips and lower back assisting in maintaining proper posture.