Master Lock® Safety Padlock, Non-Rekeyable, Alike Key, Laminated Steel Body, 3/16 in Shackle Diameter, 9/16 in Shackle Height, 1/2 in Shackle Width, Hardened Steel Shackle, 1-1/8 in Body Width, 4-Pin Tumbler Locking Mechanism, 1 Bumpers. Master Lock® 7KA Non-Rekeyable Safety Padlock, Alike Key, 3/16 in Shackle, Laminated Steel Body, 4-Pin Tumbler Locking