The chair base is made for Heavy Duty Plastic , wear-resistant, and rust-proof .28" in diameter ideal for executive Tilt/Swivel style chairs . 360-degree swivel action for easy transfer.
Standard gas cylinder .The seat plate has a fixed mounting hole, mounting hole distance: 10.2" * 6". Twist hand wheel to tighten or loosen (adjust) backward tilt tension
STANDARD GAS CYLINDER It has a 5" travel from lowest to highest. The adjustable height of the cylinder 4”.
UNIVERSAL CASTER The diameter of 5 casters is 60 mm. The friction is small with noiseless function.
EASY INSTALLATION It is extremely simple and convenient to install and operate. Only four steps are required as the picture