Stool features a stylish, durable and breathable mesh fabric seat and mesh fabric backrest. Functions include 360-degree swivel and pneumatic seat-height adjustment from 17-1/2" to 23" high. Seat capacity is 250 lb. Seat diameter is 17". Stool offers a 24" five-star chrome base and lift. Ring lift mechanism allows for easy accessibility at any position. Fixed arms (Safco T-Pad Arm Kit) are sold separately. Stool meets or exceeds ANSI/BIFMA standards.