facility to ensure good quality. Easy installing,without any tools. 3 M automotive adhesive tape is attached. Installation method: Step 1:please clean the place with 50% alcohol to make sure no dust. Step 2:remove the 3 m glue in back; Step 3 :heat the 3 m glue by hot air gun;(A tip for putting on with supplied 3 m tape is to warm the handles and the covers this makes the glue on the tape more sticky and they will stay on for ever!) Step 4:install the products in the right place ,Don't wash your car within 48 hours.