Drilling capacity
Encyclopedia
Drilling capacity indicates the maximum diameter
Diameter
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle...

 a given power drill or drill press can produce in a given material. It is essentially a proxy for the continuous torque
Torque
Torque, moment or moment of force , is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist....

the machine is capable of producing. Typically a given drill will have its capacity specified for different materials. i.e., 10mm for steel, 25mm for wood, etc.
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