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Feature
Heavy duty (400 lbs capacity),Highest End 4Big Extension-Minimum Length 13.78 Inches, Maximum Length:22 Inches, Extension: 8.22 Inches
Universal size, suitable for most stools, task chairs, office stools, computer chairs
Moves smooth and noiseless go up and down, 360 degree rotation
A plastic cap to secure the hydraulic on the top, please remove out the plastic cap when assembly.