The Ultimate Support ZKB-175 is a replacement handscrew knob for their T-fittings and stands. The knob comes with washer and nut, and measures 1.75 inches long.
One of the benefits of Ultimate Support stands is that most parts are replaceable in the field, without having to send them back to the manufacturer. If something breaks on you, you can simply replace that single part, rather than buying a new stand.
The ZKB-175 is Compatible With the Following Ultimate Support Stands: