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Master ring cylinders (which are no longer in common commercial production but were once marketed by Corbin) use this mechanism to provide independently-keyed master keying. A common door lock mechanism in Europe uses a standardized "European profile" lock module. When you hold a cylinder in your hand you get different feedback from the pins than you do on a real door. For example, Mul-T-Lock cylinders use special "telescoping" pins that contain two independently keyed tumblers. However, the design of the cylinder requires the use of special tools to manipulate the pins and apply torque. For example, Medeco locks use special wedge-shaped bottom pins that are rotated into one of several possible positions by the key cuts (which can be cut at different angles). Not all locks use a physical key. These are typically pin tumbler locks, but their orientation is "upside down" with respect to the convention for locks installed in the United States.

High security locks are more routinely installed in Europe than they are in the United States. This may be a consequence of more stringent European insurance standards for physical security. Most pin tumbler cylinders can be "master keyed" to allow more than one key bitting to operate it. In a lock with six pin stacks with a uniform chance of a pin setting at either shear line, 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. If serrated bottom pins are used as well (as they are in, e.g., certain American brand padlocks), snap guns, bump keys, or sawtooth raking are likely the only picking techniques that will succeed, especially for the novice. 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).

Most wafer locks are made to very loose tolerances and have relatively open keyways, however, and are very easy to pick. 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. Figure 6. Abus "spool" top pin. The first sign of spool and mushroom pins is that the lock will appear to be picked, but will only turn a few degrees. The pin stacks with regular pins will feel just as you'd expect, with a hard stop when the bottom pin hits the shear line. There will be a slight "backward" pressure on the torque tool. A ball may settle slightly after it appears to have stopped, possibly due to slight imperfections in the ball or the table. The billiards ball is around 61.5 mm in diameter. Billiards and snooker share similarities but also have distinct differences in terms of table size, rules, and gameplay strategies.

A ball is also considered driven off the table if it would have been driven off the table except for striking an object such as a light fixture, piece of chalk or a player which causes it to return to the table. The small end of the cue, with which the ball is struck, is fitted with a plastic, fibre, or ivory reinforcement to which is cemented a leather cue tip. When playing billiards, the goal is to hit the white cue ball so that it hits the other two balls one after another. A scoop shot, in which the cue tip contacts the playing surface and the cue ball at the same time and this causes the cue ball to rise off the cloth, is treated like a miscue. The basic principles of operation are essentially the same as those of the standard pin tumbler lock, except that the tumblers are exposed at the front of the cylinder and a round ("tubular") key is used. The Primus sidebar is keyed by additional side tumblers that engage a secondary bitting cut into the side of the key. The sidebar must engage these grooves in order to retract and allow plug rotation.

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