The Master Lock Commercial Magnum M5STS Laminated Steel Padlock features a 2-in.-wide laminated steel body encased in a stainless-steel cover for maximum strength and weatherability. The 3/8-in. diameter octagonal shackle is 1 in. long and made of chrome-plated boron carbide, offering superior resistance to cutting and sawing. Ideal for use on job boxes, Commercial Magnum offers a higher level of security for applications in outdoor, corrosive and caustic environments.