Fastens rear boot lid tightly during driving, avoids accidental bounce of luggage compartment on bumpy roads. For W251 W164 A1647400435 A1647400735 1647400335 Lock Mechanism Tailgate Boot Lid Reliable locking structure secures your belongings well during daily commutes and long travels. Excellent sealing and locking effect, keeps dust, rain and dirt out of the trunk compartment. Function performance: Works well with central lock system, solves trunk fail to open or lock issues, Manufacturer: ATGCBCAUF