Ercole M11-002 Spigot Steel 1/4″-20 & 3/8″-16 female threads

The Avenger F831TH Baby Female Swivel with Ball can convert an arm or dowel up to 16mm (5/8″) in diameter into a boom arm. It can add versatility to your non-swivelling light fixture (with optional #013) to make it more versatile. Each end has a locking Baby 16mm (5/8″) receiver. The ball joint has a pull-and-lock aluminium alloy handle with anti-rotation springs. It weighs 0.8 kg (1.76 lb).

16mm female adapter.

Avenger B143 Adaptor Bushing D.60 for Strato-Safe.