American Lock A1107 Master Lock Red Lockout Padlock Master features a Anodized Aluminum body material. The padlock measures 1-7/8 Inches in length with a 1-1/2 Inch width The shackle material is chrome-plated boron steel for strength and security. It includes a 5-pin tumbler locking mechanism. This padlock complies with OSHA 1910.147 standards.