It's small (about 2-4mm long, 1mm thick) normally pale beige and fluted.
show me what 4mm look like on a ruler. Compare 4mm to another image, like a bug or a dime, or a string etc.
25mm - 4mm thick150mm -4mm thick50mm - 4mm thick
Small and round.
4mm sheet metal falls 24 gauge and 25 gauge. 24 gauge sheet metal is 3.175mm (0.125") thick, and 25 gauge sheet metal is 6.35 (0.25") mm thick.
29 bones in a cat's skull
Four millimeters is very thick in some materials and very thin in others. It depends on what kind of material you are measuring. It is less than a centimeter.
50 mm dia gi pipe 4mm thick
A 4mm diamond measures 4mm in at least one measurement.
Most omega enhancers will fit on a 2.5mm regular -- 4mm reversible omega chain.
4mm its in the question
4mm is 0.15748032 of an inch.