4mm
Slender metric measurement
4mm is four millimeters—a unit of length equal to about 5/32 of an inch, roughly the thickness of two stacked pennies.
The notation appears in technical specifications, craft supplies, and product dimensions: 4mm knitting needles, 4mm hex bolt, 4mm cable.
Thousandth of a meter
- caliperTool measuring thickness or diameter
- micrometerMillionth of a meter
- gaugeStandard of measurement
- rulerOne who governs
metric · scale · vernier · tolerance · graduation · precision · dimension · thickness
Pierced ornament for threading
- bearingPosture or orientation
- LEDSemiconductor that glows
- socketHollow receiving cavity
- jackDevice for lifting vehicles
plug · connector · terminal · rivet · grommet · bushing · spacer · washer
millimeter
Thousandth of a meter
- caliperTool measuring thickness or diameter
- micrometerMillionth of a meter
- gaugeStandard of measurement
ruler · metric · scale · vernier · tolerance · graduation · precision · dimension · thickness · diameter
bead
Pierced ornament for threading
jack · plug · connector · terminal · rivet · grommet · bushing · spacer · washer · screw
model
Representation or paradigm
- figurineSmall ornamental sculpture
- dioramaEnclosed miniature scene display
- wargamingSimulating military conflicts recreationally
scale · detail · painting · basing · terrain · tabletop · collectible · hobby · kit · assembly
caliber
Bore diameter or quality