Master Lock: Laminated Steel 51mm Padlock 4-Pin - 38mm Shackle - Keyed Alike MLK5LFKA1 The classic Master Lock Laminated Steel Padlock, invented by company founder Harry Soref and built to stand up to physical abuse, offers real dependable protection. For over 90 years, Master Lock Laminated Steel Padlocks have been 'Tough Under Fire'. Each padlock has a laminated steel body, hardened steel shackle and dual locking levers. A variety of multi-pack options, where all padlocks in the pack open with the same key (keyed alike), are also available. Padlocks are available with 4-pins and with long shackle options for a wider range of possible application options. All Master Lock padlocks are supplied with a minimum of 2 keys and a Lifetime Warranty against mechanical failure. Suggested uses sheds, residential gates and garages. The Master Lock 5KALF-A118 has the following specifications 51mm laminated steel padlock - 38mm hardened steel long shackle, 8mm diameter - 4-pins - keyed alike MPN: