1-3/4", Universal Pin Padlock, For Master Lock Universal Pin System, No Keys Included, Use Hand Held Keying Tool #376, TV #575-563 To Rekey Universal Pin Padlock, 15/16" Shackle, 5/16" Shackle Diameter, Uses Master Lock Key Blank K1BOX Or Ilco Blank M1 TV #320-952, Boxed.