The hydraulic design operates with a simple, intuitive lever (typically located under the seat)：a light press releases the height lock, allowing you to glide the seat up or down to your desired position.
CRAFTSMAN Adjustable Hydraulic Shop Stool – Brand New Heavy-Duty Garage Mechanic
Adjustable Garage Shop Stool Rolling Work Stool Mechanic Work Seat With Casters
Height Adjustable Garage Shop Stool, Swivel Work Stool, Black Bar Chair
US Adjustable Garage Shop Stool Mechanic Work Shop Seat Chair w/ Casters
Adjustable Rolling Shop Stool with 300 lbs. Capacity, Pneumatic Garage Seat, 360
