1.Sturdy structure: The door lock latch adopts a three-steel ball positioning design, which can open the positioning function from three different angles; the solid round head lock is and firm. The bottom plate of the anti-theft door buckle is designed with four nail holes, which are not easy to fall off under strong collision. 2.Door latches are constructed from premium solid aluminium alloy with beautiful polishing and finish to complement your lovely home decor. Door locks are difficult to rust or oxidize and will serve longer life. Ultra-thick swing arm and solid lock base ensure strong and durable quality, and resist up to 600 lbs force. Home security door lock can be unlocked easily from the inside with simple swinging motion, while too strong to be forced open from the outside. 3.Made of Zinc alloy, surface drawing,4 x Door Latch, each latch is equipped with 7 screws,The rotating shaft is equipped with precision steel balls, and the position of the third gear is adjusted, and the door lock is opened and closed more smoothly. The base panel is thickened, and the screw holes are fixed at three points to make the latch installation more secure. 4.Door latches are constructed from premium solid Zinc alloy with beautiful polishing and finish to complement your lovely home decor. Door locks are difficult to rust or oxidize and will serve longer life. Ultra-thick swing arm and solid lock base ensure strong and durable quality, and resist up to 600 lbs force. Home security door lock can be unlocked easily from the inside with simple swinging motion, while too strong to be forced open from the outside.