Mul-t-lock TSR-Series padlock - 7/16" Shackle (4 Chamber) TSR25 Interactive Plus Key System High Security Padlock All Mul-t-lock items come standard with 2 keys and 1 Mul-lock key code I.D. card. Shackle Diameter: 7/16", 1" Vertical Clearance, 7/8" Horizontal Clearance Extra keys available upon presentation of control card to authorized dealers