[Size]Center distance of set up Hollow: 2.36×1.2 inch. Hollow measurement: 0.7inch
[7cm adjustable height] The peak of the armrest is among 31-38cm, and The peak will also be adjusted via 7cm
[Move left and right] The armrest pad will also be circled left and proper via twisting
[Move back and forth] The 3-d armrest pad can transfer from side to side
[Sold in Pairs] Include handrails, one set up package deal, one set up guideline
