Safco Products 5110 Task Master Economy Workbench Chair (Additional options sold separately), Black Task Master economy workbench swivel task chair Self-skinning polyurethane foam seat and back with 2" seat cushion Pneumatic seat height adjustment 19" to 27"H, 360 degree swivel, ergo knob adjusts back height, tilt adjustment, tilt lock Five-star nylon base with telescoping dust cover, footrest ring and 2 1/2" floor glides Safco Products optional carpet casters 5131 and Inserts 5130, hard floor casters 5132, Floor Glides 5138 and Closed Loop 5143 or T-Pad 5144 Armrests, sold separately