Product name:adjustable armrest Adjustable range:90 Degree Recommended mounting height:the distance between cushion and the underside of the armrest is 11cm(or updown 2cm according to you need) Adjustable,Shock ,Wear-resistanceThis comfort armrests offer you added comfort whilst driving,which are pivoting and adjustableThese are commonly used on Car,for ,Motorhomes,for ,Boats,Trucks etc. Colour:Black Material: plastic + PU leather Size:355cm Installation: 1Open the cover of the back. 2please sit on your and make the mark on the position where is the most comfortable to you. 3drill two holes on the mark you have made. 4fix the armrest mount to your by screw given. 5open a little hole on the sponge,then take the axis out of the sponge. 6As for the cover,it is the same with last step. 7Fix the armrest to the parts from the outside,and fix the screw. 8Put on the lid. Package Contents: 1 x armrest(Right) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +- 1-3cm.