Pinhead and Hexlox are both fine products, but Pitlock has two unique and effective security features that set it apart from its competitors. Pitlocks have both a coded nut that protects against theft and a specially designed spring washer. The spring washer is anchored by the coded nut which locks the closure. The Pit keys are used to unlock the whole mechanism. The keys’ side panels press and turn the springs of the spring washer at the same time (similar to the way child safety locks on medicine bottles work.)
Because of the mechanism that requires dual pressure and the coded nut, pliers are not able to break into the system. Opposite the locking mechanism, the conical security ring is pivoted so that it can’t be cut by using force.