Master Lock® Safety Padlock, Combination Resettable, Keyless Key, Laminated Steel Body, 5/16 in Shackle Diameter, 1 in Shackle Height, 1 in Shackle Width, Solid Brass Shackle, 2 in Body Width, Combination Locking Mechanism. Master Lock® 175 Combination Resettable Safety Padlock, Keyless Key, 5/16 in Shackle, Laminated Steel Body, Combination Locking