Length quoted is hexagonal spacer length, the hexagon does not skid easily.for PC motherboard, PC case, and other PCB board mount.Product Name : Standoff Hexagonal SpacerThread Size : M3 Male to Female 4mm+6mmOverall Size(Approx) : 10x 5mm / 0.4" x 0.2" (L*Max.D)Material : BrassColor : Gold ToneNet Weight : 30gPackage Content : 10 x Standoff Hexagonal SpacerNote:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.