Master Lock® Safety Padlock, Commercial Grade Non-Rekeyable, Alike Key, Laminated Steel Body, 5/16 in Shackle Diameter, 15/16 in Shackle Height, 3/4 in Shackle Width, Hardened Steel Shackle, 1-3/4 in Body Width, 4-Pin W1RSV Cylindrical Locking Mechanism. Master Lock® 1KAW1RSV Commercial Grade Non-Rekeyable Safety Padlock, Alike Key, 5/16 in Shackle, Laminated Steel Body