The seat plate has a fixed mounting hole, mounting hole distance: 10" 6". Twist hand wheel to tighten or loosen (adjust) backward tilt tension? - It has a 4.7 travel from lowest to highest.
The adjustable height of the cylinder 4. - The diameter of 5 casters is 60 mm.
The friction is small with noiseless function. - It is extremely simple and convenient to install and operate.
Only four steps are required as the picture.