[Size]Center distance of set up Hollow: 2.36×1.2 inch. Hollow measurement: 0.7 inch
[7cm adjustable height] The peak of the armrest is among 31-38cm, and The peak may also be adjusted by means of 7cm
[Move back and forth] Press the button, the armrest pad can transfer backward and forward
[Move left and right] Press the button, the 4D armrest may also be translated left and proper, or turned around 40 levels left and proper
[Sold in Pairs] Include handrails, one set up package deal, one set up guideline
