2-3/4" Shielded Lock, Keyed Alike To #0501, Disc Shaped Stainless Steel Body Repels Forced Attacks, 2 Interior Anti-Saw Levers Deter Cutting The Body, Hardened Steel Shackle, Pin Tumbler Lock With Double Locking Deadbolt Action, 3/4" Shackle, 3/8" Shackle Diameter, Uses Master Lock Key Blank K1BOX Or Ilco Blank M1 TV #320-952, Carded.