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Item #0099 — 5⁄8 Inch (Nominal) Spigot — 1⁄4"-20 Threaded Stud one end — 1⁄4"-20 Threaded Hole other end
This spigot fits the standard 5⁄8 inch (nominal) hole on many lighting accessories, such as umbrella adapters, swivel brackets, clamps & adapters. One end has a 1⁄4" X 20 threaded stud & the other end has a 1⁄4" X 16 threaded hole.