These Master Lock Stainless Steel Padlocks feature a 2in (51mm) wide laminated stainless steel body for maximum strength, reliability, and weather resistance. The 3/8in (10mm) diameter shackle is 2" long and made of stainless steel, offering maximum resistance to cutting, sawing, and weather. The 4-pin cylinder prevents picking and the dual locking ball bearings provide resistance against prying and hammering.