Applicable Door Thickness -- The door knob lock fits all doors with 25-45mm thickness. Please measure the door thickness before installation to avoid door damage. Adjustbale Latch Design -- The bedroom door lock has adjustable latch to fit 2-3/8(60mm) or 2-3/4(70mm) backset. Lock and Key Design -- The door lock comes with 3 keys, which can give you a security when lose one of the key. No need to worry the match of lock and key. Premium Material -- The lock cylinder and key are made from premium copper material. It helps your door easily get locked and open to reduce lock damage and keep your home safe. High Presion -- The door lock with key is designed with high precision and fine workmanship. You can easily get it installed and reduce the risk of getting locked indoor without help. Color:As Shown Material:201 Stainless Steel Lock Cylinder Material:Copper Key Material:Copper For Door Thickness:25- 45mm.Items from Sheng Xinshun's shopProducts from KJ's store