Master Lock® Safety Padlock, Non-Rekeyable, Alike Key, Laminated Steel Body, 5/16 in Shackle Diameter, 2-1/2 in Shackle Height, 3/4 in Shackle Width, Hardened Steel Shackle, 1-3/4 in Body Width, 4-Pin Tumbler Locking Mechanism. Master Lock® 1TRILJ Non-Rekeyable Safety Padlock with 2-1/2 in Shackle, Alike Key, 5/16 in Shackle, Laminated Steel Body