Adjustable,Shock resistance, Wear-resistance. This comfort armrests offer you added comfort whilst driving,which are pivoting and adjustable. Can be applied to different seats;The adjustment range is large,meeting different requirements(based on the horizontal plane,the upward adjustment can be 90 degrees,and the lower adjustment can be about 41 degrees). Installation: Open the cover of the seat back.Please sit on your seat and make the mark on the position where is the most comfortable to you. Drill two holes on the mark you have made. Fix the armrest mount to your seat by screw given. Open a little hole on the sponge, then take the axis out of the sponge. As for the cover, it is the same with last step.Fix the armrest to the parts from the outside, and fix the screw. Put on the lid. Installation profile: 1. Open the carton,and please check all the items. 2. Open the cover of the seat back. 3. please sit on your seat and make the mark on the position where is the most comfortable to you. 4. drill two holes on the mark you have made. 5. fix the armrest mount to your seat by screw given. 6. open a little hole on the sponge, then take the axis out of the sponge. 7. As for the cover, it is the same with last step. 8. Fix the armrest to the parts from the outside, and fix the screw. 9. Put on the lid.that's ok. Product name:Adjustable Armrests Condition:New Hole spacing 8.5 cm No holes or holes do not match the distance between the holes punched or welded fixing, flexible control Adjustable range:0-120 degree Function:Step-less regulation Type of key component:PU foam,cover plastic frame,metal mounting bracket Characteristic:adjustable,shock resistance,wear-resisting Application:Car,for ,Motorhomes,for ,Boats,Trucks etc. Colour:Black Material:Plastic+PU leather Package Contents: 1Pair * Universal Adjustable Seat Armrest Left+Right Only the above package content, other products are not included. Note: Light reflection 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.