Abstract: An adjustable cable loop locking system for securing two spaced apart articles, such as a boat to dock piling, with a length of flexible cable is disclosed. The system includes first and second mechanisms slidably disposed on opposite end portions of a cable in which are formed first and second cable loops respectively. A flexible sheath, which may be a conventional hollow hydraulic hose, slidably covers a central portion of cable and is affixed on opposite ends thereof to the first and second mechanisms to fix the distance between the mechanism as measured along the central portion of the cable. The two lead-in portions of the first loop slidably extend through the first mechanism except that one of these lead-in portions which contains a free end of the cable can be selectively locked in a stationary position in the first mechanism by operation of a locking handle when desired.