●16" - 22" Height Adjustment: Featuring a SGS certified pneumatic rod, this rolling stool chair can be smoothly and freely adjusted from 16" lowest height to 22" highest height. All you need to do is lift the lever up or down. Therefore, you don't need to bend, kneel or crouch anymore. ●Flexible to Use, Cozy to Sit: With a 360° rotatable seat and 4 universal casters, this rolling mechanic stool allows you to go wherever you want, making repairing no more restriction. Besides, the 2 inches soft padded seat provides you with a soft touch for a comfortable sitting experience. ●Keep Tools Close to Hand: This adjustable roller seat features a tool tray with 4 removable chassis that allow you to fetch the needed tools with ease. And the magnetic quarter chassis will be the perfect space to store small tools to prevent them from being lost. ●330 LBS Stronger Capacity: Supported by heavy-duty and rustproof metal material, this adjustable rolling stool chair comes with 330 lbs strong loading capacity while ensuring higher durability. And the waterproof and oil-proof faux leather is easy to clean. ●Simple Installation: The assembly is quite easy. Step 1: assemble 4 casters. Step 2: assemble the tool tray (please put 4 chassis first). Step 3: insert the pneumatic rod to the base. Step 4: attach the seat onto the small end of the pneumatic rod.