The unique part of this item is that it Rotates over 180 degrees. This allows the item connected at one end to rotate.nice for an adjustable
Lamp Part Neck
Vintage Industrial Steampunk Rotating Gear Adjustable Brass Table
I don't think it is solid brass.it is magnetic. I've used a lot of these Neck/Spacers on my lamp projects over the years.Lots of Possibilities!
Vintage Heavy Metal 1-1/8 Lamp Neck Spacer 1/4ips Slip Lamp Parts - Steampunk!
Spacer Lamp Part
Vintage Repurposed Otto Bernz Co Brass Blow Torch Rochester NY
Steampunk Lamp, Antique Gear and Antique Service Station Shade #418
Steampunk Parts In Collectible Lamp Parts for sale
Lamp Necks Grand Brass Lamp Parts, LLC.
Solid Brass small base
Cast Metal Lamp Base