Specification: Product name: Adjustable Armrests. Color: Black. Quantity: 1 set. Type of key component:PU foam,cover plastic frame,metal mounting bracket. Adjustable scope: 0-120 degree. Material: PU,plastic, metal. Function: Step-less regulation. Size: 39x7.5x9.5cm. Insert: iron/ABS. Surface material: PU integral skin foam. Characteristic:adjustable,shock resistance,wear-resisting. Application: for vehicle seat. Installation steps: 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. 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.thats ok. Package Included: 2 x adjustable armrests