Free Shipping! ProAm USA Light Stand Spigot Adapters, Screw Adapters & Thread Converter Rings (6 Each) 1/4"-20 to 3/8"-16 Light Stand Adapters, 1/4"-20 to 1/4"-20 Screw Adapters, 1/4"-20 to 3/8"-16 Converter Rings, Aluminum & Steel Construction