Safco Products 5120 Task Master Deluxe Industrial Chair (Additional options sold separately), Black Task Master high-back deluxe industrial workbench swivel task chair Self-skinning polyurethane foam seat and back with 2" seat cushion Pneumatic seat height adjustment 17" to 35"H, 360 degree swivel, ergo knob adjusts back height 5-leg, tubular steel 26" dia. base with high-impact nylon glides, 3 levels of footrests mount to base, extends height 10" Safco Products optional carpet casters 5131 and Inserts 5130, hard floor casters 5132, Floor 5138 and Closed Loop 5143 or T-Pad 5144 Armrests, sold separately