The Master Lock No. 311SSTRILF Stainless Steel Padlocks feature a 1-9/16 inch (40mm) laminated steel body design, with a tough weather coated finish for maximum strength and reliability. The 9/32 inch (7mm) diameter shackle is 1-1/2 inch(38mm) long and made of stainless steel, offering extra resistance to cutting, sawing, and weather. A black weather resistant thermoplastic shell is designed to add protection against moisture, dirt and grime. The 4-pin cylinder prevents picking and the dual locking levers provide resistance against prying and hammering. The Lifetime Guarantee provides peace of mind from a brand you can trust.