Master Lock® safety padlock, commercial grade non-rekeyable, alike key, laminated steel body, 5/16 in shackle dia, 15/16 in shackle H, 3/4 in shackle W, hardened steel shackle, 1-3/4 in body W, 1-5/16 in body H, 7/8 in body thickness, 4-pin tumbler, 2 bumpers. Master Lock® 1KA-2001 Commercial Grade Non-Rekeyable Safety Padlock, Alike Key, 5/16 in Shackle, Laminated Steel Body