Keylock switches are activated by a key that is turned in a circle and can stop in a range of positions. Important physical specifications to consider when searching for keylock switches are the angle between positions and the mechanical life.  The angular distance (in degrees) between positions is important to consider. For example, for a 4-position switch, the angle of throw is 90 degrees, for a 100-position switch, the angle of throw is 3.6 degrees.  The mechanical life is the maximum life expectancy of the switch. Often, electrical life expectancy is less than mechanical life, please consult manufacturer.