This is M3 x 50mm Female Thread Brass Hex Standoff Pillar Rod Spacer Coupler Nut.Brass Material, Hex Head, Female Type Threaded Rod Pillar Standoff.
Ideal for coupling use. Dual Ends Brass Pillar PCB Standoff Hexagonal Spacer, Hex Brass Standoff spacer Female to Female Spacing Screws Double pass Hex Long Nuts.

Package Includes:

1x spacer