The Master Lock 1-3/4 in. Stainless Steel Pin Tumbler Padlock with Shackle features a 1-3/4 in.(44mm) wide laminated stainless steel body for maximum strength, reliability, and weather resistance. The 5/16 in. (8mm) diameter shackle is 2 in. (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. The Lifetime Guarantee provides peace of mind from a brand you can trust.