This padlock features a laminated stainless steel body for maximum strength, reliability, and weather resistance. The 5/16-inch diameter shackle is 2.5 inches long and made of stainless steel, offering extra resistance to cutting, sawing, and weather. The four-pin cylinder prevents picking, and the dual locking ball bearings provide resistance against prying and hammering. A lifetime guarantee provides peace of mind from a brand you can trust.