The Manfrotto 026 Lite-Tite Swivel is a well-made accessory that attaches to a lightstand and provides couplings for accessory studs and an umbrella. While some of the locking handles are plastic, the threads and body of the swivel are solid cast metal and the two provided studs are machined brass. More expensive than your average eBay special, but worth it. In excellent condition. Includes a  removable cold shoe mount (non-Manfrotto, but serviceable)

Image is for illustrative purposes only. Actual item may differ slightly.