Metric Hex Bit Socket Set

socket set
A number of detachable sockets of different sizes for use with a socket wrench
A socket wrench, more commonly referred to as a ratchet, is a type of wrench, or tightening tool, that uses separate, removable sockets to fit many different sizes of fittings and fasteners, most commonly nuts and bolts.

hex bit
A screwdriver bit with six sides

metric
A system or standard of measurement
measured: the rhythmic arrangement of syllables
Metric units, or the metric system
metric function: a function of a topological space that gives, for any two points in the space, a value equal to the distance between them
based on the meter as a standard of measurement; "the metric system"; "metrical equivalents"
A binary function of a topological space that gives, for any two points of the space, a value equal to the distance between them, or to a value treated as analogous to distance for the purpose of analysis