The typical combination lock design involves a set of (usually three or four) disk tumblers around a spindle connected to the external dial. The game is played with three balls, two white and one red, with one of the white balls having a small red dot, or spot, to distinguish it. The game is played with 22 balls, made up of one white ball (the cue ball), 15 red balls, and six numbered coloured balls including one yellow 2, one green 3, one brown 4, one blue 5, one pink 6, and one black (valued at 7 points). WHEN IS THE ANNUAL CUE ISSUE? Billiards is a classic cue sport that involves players using a cue stick to strike cue balls, aiming to pocket object balls into designated pockets on the billiard table. The usual scheme for master keying involves using more than one cut in some or all pin stacks (this is accomplished by adding additional pin segments). In a lock with six pin stacks with a uniform chance of a pin setting at either shear line, what is billiards the probability of a picked lock actually opening is only 1/64. Picking techniques for these locks involve the use of special torque tools designed to put torque on only one of the two concentric plugs.

In addition to making picking more difficult, secondary locking mechanisms are sometimes also intended to make it more difficult to reproduce unauthorized copies of keys. High-security locks often incorporate one or more secondary locking mechanisms beyond that provided by the conventional pin tumblers. These locks are no more or less inherently secure than standard pin tumbler locks, although the external exposure of their pins makes picking them (and designing sophisticated picking tools for them) somewhat simpler. Picking these locks involves putting torque on the locking bolt and raising the gates to the correct height. Lever locks employ a set of "lever" tumblers raised to a specific height by the key bitting. The Primus sidebar is keyed by additional side tumblers that engage a secondary bitting cut into the side of the key. Other lock types include "European profile" cylinders, master keyed locks, master ring and SFIC cylinders, tubular pin tumbler locks, dimple-key pin tumbler locks, pin tumbler locks with secondary locking mechanisms, wafer tumbler locks, disk tumbler locks, lever tumbler locks, combination locks, and electronic locks.

A common door lock mechanism in Europe uses a standardized "European profile" lock module. Although combination lock manipulation exploits some of the same kinds of imperfections as pin tumbler lock picking, the principles and techniques are quite different and are well beyond the scope of this document. These locks can be picked according to the same principles as used for ordinary pin tumbler locks, but, again, different tools are used to accommodate the different shape of the keyway. If just one pin sets at the "other" shear line, the lock will not open even though all the pin stacks are picked. Now release torque and start over, taking care to pick all the pin stacks with spool/mushroom pins while leaving at least one regular pin stack unset (this will require a light touch and good sensitivity). While the pin tumbler cylinder is by far the most popular door locking mechanism in the United States, it is not the only kind of keyed lock in common use. Drill a 1-3/8 inch hole and use the mounting hardware supplied with the cylinder.

Not all locks use a physical key. These locks are often quite susceptible to rubbing and jiggle-key raking. Again we know everything: the starting conditions are known completely, the box is completely understood &c &c. Special double-sided jiggle-rake picks are commercially available for such locks. However, the design of the cylinder requires the use of special tools to manipulate the pins and apply torque. For example, Mul-T-Lock cylinders use special "telescoping" pins that contain two independently keyed tumblers. Each pins has a groove cut in its side at the position corresponding to its correct rotation. In fact, master keyed pin stacks are easier to pick than those that are single-keyed; there are two chances to lift a cut to the shear line. Many inexpensive locks, especially low-security "cam" locks such as those used to secure furniture and cabinets, do not use pin stacks for their tumblers. In general, wafer lock picking employs the same techniques and tools as those used for pin tumbler locks.