Shop Metric Plugs
Metric threads are extremely common in Europe and uses inner and outer diameter measurements called out in millimeters. The letter 'M' is
usually part of the callout, followed by the millimeter measurement of the outside diameter (OD), then the thread pitch. For example, M22x1.5 indicates it is a
Metric adapter with a 22mm male thread OD and a 1.5mm thread pitch.
