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Many manufacturers outfit their picks with elaborate and supposedly "ergonomic" handles, but these often hinder performance as much as they might enhance it. Picking depends on weaknesses in the implementation of locks -- small manufacturing imperfections -- rather than fundamental, abstract design flaws that would be present no matter how carefully made the locks might be. In practice, of course, locks aren't perfect: the pin holes in the plug are slightly out of alignment with respect to the shell and the pins and pin holes are each of a slightly different diameter. In the locked state the plug is prevented from rotating by a set of movable pin stacks, typically under spring pressure, that protrude from holes in the top of the opening in the shell into corresponding holes drilled into the top of the plug. Around the circumference of the plug is a shell, which is fixed to the door or container. Note the border between the plug and shell, which forms the shear line, and the cuts in each pin stack resting within the plug. Pin tumbler lock picking consists of raising the cuts on each pin stack to the shear line, one by one, until the plug turns freely.

For most of the picking methods discussed here, in which tumblers are manipulated one by one, a "hook"-style pick is generally used. Few burglars can afford to risk exposure during the time required to pick even relatively easy locks, and unexplained possession of lock picking tools is often considered prima facia evidence of criminal intent. In the lab there is a collection of "training locks," mounted on boards, for practice. The numbers on the front of the practice locks indicate the keying codes, from the front-most pin stack to the rear-most. Good tools are important, to be sure, but once a few basic tools are available the student of lock picking is usually better off investing in new locks on which to practice rather than in new picking tools. Picking locks requires skill, practice, and the use of rather unusual (and not widely available) tools. However, the design of the cylinder requires the use of special tools to manipulate the pins and apply torque.

Both the pick and the torque tool also amplify and transmit feedback about the state of the lock back to their user. The basic skills of pin tumbler lock picking include selecting the proper tools, manipulating pins through the keyway, applying torque, and recognizing the state of each pin. Picking tools are designed to perform one of two basic functions: manipulating pins and turning the plug. The basic algorithm for picking locks is remarkably simple: - Apply a small amount of torque to the plug. This style of tool is especially useful for holding open automotive locks that have spring-loaded dust covers. Typical commercial and residential locks have five or six pin stacks (although four and seven aren't unheard of), with from four to ten distinct cut depths used on each. It's much easier to learn each skill in isolation, using locks specifically set up for the purpose. If the shear line is within this gap as torque is applied, it may set. The typical combination lock design involves a set of (usually three or four) disk tumblers around a spindle connected to the external dial. The other principal games are played on tables that have six pockets, one at each corner and one in each of the long sides; these games include English billiards, played with three balls; snooker, played with 21 balls and a cue ball; and pocket billiards, or pool, played with 15 balls and a cue ball.

Solids. Object balls that have a solid color. It is solid white in the game of pool, but in carom billiards, one player may play with a spotted or even a yellow cue ball. One of the white balls (plain or spot) serves as the cue ball for each player, the red ball and other white ball serving as his object balls. 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). It utilized bent sticks and balls made of leather, and seems to have been a kind of cross-country hockey game. See Figure 2. The plug will be blocked from rotating if any pin stack is lifted either not far enough (with the cut still in the plug below the shear line) or too far (with the cut pushed above the shear line and into the shell); to rotate, all pin stacks must have a cut at the shear line.

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