Keyed Padlocks by Master Lock. Details:The Master Lock 3DLF Laminated Padlock with Key features a 1-9/16 in. (40mm) wide laminated steel body for maximum strength and reliability. The 9/32 in. (7mm) diameter shackle is 1-1/2 in. (38mm) long and made of hardened steel, offering extra resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking ball bearings provide resistance against prying and hammering.