Kaleurrier Saddle Stool Rolling Swivel Height Adjustable with Wheels,Heavy Duty Anti-Fatigue Stool,Ergonomic Stool Chair for Lab,Clinic,Dentist,Salon,Massage,Office and Home Kitchen (With Back, Black) : Saddle stool designed with ergonomic seat and back rest to encourage better posture & save your back and spine. The design is much more comfortable and relaxing than normal stool chairs. Heavy duty stool made of high quality materials, well constructed, sturdy and durable. Can support 350 lbs. max weight.Stool chair with anti-exploding iron plate guarantees the safety of seat. Hydraulic adjustable stool equipped with a smooth operating gas lift cylinder which adjusts height from 22 to 30 and makes seat 360° swivel. Smooth rolling stool with reinforced nylon twin wheel casters allow for easy movements and noisy-free environment,easy to roll on hard floor & safe for soft floor. Simplified and easy installation, no tools required.