This Master Lock stainless steel padlock features a 1-3/4in (44mm) wide laminated stainless steel body for maximum strength, reliability, and weather resistance. The 5/16in (8mm) diameter shackle is 2in (51mm) long and made of stainless steel, offering extra resistance to cutting, sawing, and weather. The 4-pin cylinder prevents picking and the dual locking ball bearings provide resistance against prying and hammering.