A Nylon Hex Standoff Spacer 3mm x 15mm (commonly known as an M3 x 15mm spacer) is a small plastic hardware piece used to lift, separate, or secure printed circuit boards (PCBs) and electronics. It prevents short circuits by keeping metal boards away from conductive chassis surfaces.

Thread Size: 3 mm (M3 metric standard)
Length: 15 mm (height of the main hex body)
Shape: Hexagonal (easy to tighten using a small wrench or pliers)
Material: Durable, lightweight, and non-conductive nylon plastic (PA66)
Configurations: Available in Female-to-Female or Male-to-Female (which often includes an extra ~6mm threaded screw post on one end)