Office Chair Cylinder Replacement-Heavy Duty 5.5 Inch Gas Lift Cylinder, Nitriding Heavy-Duty Class 4 Office Chair Gas Cylinder - level SGS and BIFMA certification tests for Superior Quality and Safer . The nitriding gas cylinder wall adds 1.5mm thickness for enhanced ruggedness, offering explosion-proof performance and the ability to support heavier weights and more lifts, ensuring long-lasting use. Maximum load capacity 1000lbs 5.5 Inch Adjustable Office Chair Gas Cylinder ? Height Adjustable from 11.22? to 16.73? (285mm to 425mm ?Higher than normal cylinder) for Comfortable Sitting. Whether working, gaming, or relaxing, this chair gas lift cylinder provides smooth, reliable height adjustment for optimal comfort and support Standard Office Chair Cylinder ? Outer Tube: 2 inches, Inner Tube: 1.1 inches. Compatible with 99% of office chairs, gaming chairs, executive chairs, salon chairs, and rolling stools. Be sure to measure your chair before purchasing to ensure a perfect gas cylinder fit 3 Minute Quick and EASY Fix for Office Chairs ? If your chair won?t lift, makes noise, or the chair piston is broken, replace the damaged part instead of buying a new chair. Save money and restore your chair to like-new condition quickly and easily 1 YEARS WARRANTY- 24/7 SERVICE: Our goal is to provide you with high-quality products and exceptional service. If you encounter any issues, please feel free to reach out to us anytime for a satisfactory solution