The product is a set of 5 Compx USPS-L-1172C National Mailbox Locks, model C9100, made of stainless steel. Each lock comes with 3 keys for security. The product also includes a California Prop 65 Warning for residents of California, indicating potential exposure to chemicals that may cause cancer and birth defects. These locks are designed for home improvement projects related to building and hardware, specifically for use on doors and in mailboxes.