Perforation-free Sliding Door And Window Transparent Stopper Hidden Door And Window Lock Type Household Lock Features: No need to punch holes in the doors and , avoiding the damage to the door and window structure, and fast installation, suitable for various materials of doors and . Transparent , beautiful and does not damage the overall appearance of doors and , while not affecting lighting. Locks can be hidden installation, inconspicuous, does not affect the normal use of doors and , while increasing security. Designed for children, effectively children from opening doors and , avoid accidents, suitable for families with children. It can limit the opening angle of doors and , excessive opening of doors and , and at the same time play the role of windproof and -theft. Product Description: Perforation-free sliding door and window transparent stopper hidden door and window lock type household lock*1 Product contains: 2 packs