Square base, improved 60° angle design, compared with the round base, the glue utilization rate is increased by more than 30% and the connection is stronger Key for unlocking: Sticky window lock with strong load-bearing capacity. 2 keys for unlocking are included. Children cannot reach them if they are properly secured. Child safety: Keep curious children away from windows, doors, refrigerators, etc. to avoid injury. Easy installation: no drilling, no special skills required Wide range of applications: perfect for doors, windows, refrigerators, etc., on a variety of dry and smooth surfaces