Material: stainless steel. Product name: door chain Hand-drawn surface made of high quality stainless steel to prevent corrosion and long service life Product information: the door chain cover Stainless Steel Security Slide Bolt Door Chain is made of stamped and formed 201 stainless steel, the surface is smooth and textured, corrosion resistant and primary rust-proof; the anti-theft chain bolt can be used for various door types, and can be placed above or beside the door frame. It has a welded steel chain 185mm long. Uses: chain locks for hinged swing doors, opening entrances for safe viewing. This padlock with chain allows the door to be partially opened to identify visitors or receive packages. EASY TO INSTALL: The chain guard can be used on different types of wooden or metal doors. It can be placed on or next to the door frame. This latch is very easy to install and has a solid design. Four mounting screws are included, no additional screws are required.