Abstract: A anti-theft device for removably placing around the cylinder of a stabilizer leg of heavy machinery such that the cylinder may not be retracted. The anti-theft device includes a shaft. The shaft is elongate and has a first and second end. The shaft is hollow such that the shaft has an inner surface and an outer surface. Each of the first and second ends is open. The shaft is divided into two substantially equal portions along a line orientated generally parallel to a longitudinal axis of the shaft. Each of the portions has a pair of free edges. A first free edge of a first portion is hingedly coupled to a first free edge of the second portion such that the second free edges are abuttable. A closed position is defined by the second free edges being abutted. A latching means coupled to the shaft removably latches the first portion to the second portion in the closed position.