Manfrotto 155 Head Double Ball w/ 143 14.5cm. 2x 16mm studs with Camera/Umbrella Bracket

Due to its spring loaded clamping, this cold shoe clamp enables one to one-handedly mount shoe fitted equipment very easily. Its finger screw serves both as a push knob for opening the clamp and for tightening down the clamping securely.
It fits the standard shoe sizes of 18, 20 and 22mm.
The Cold Shoe Clamp is tapped with 1/4″-20 and 3/8″-16 holes on the back side

Ercole M11-051 Umbrella Swivel Adapter with adjustable cold shoe.

This is a Tilthead with Spigot. It is a safe and secure way to mount any light fixture or accessory with a 5/8” receiver on a stand. The Tilthead features a ratchet locking knob that prevents sudden movements when released. A built-in umbrella receptacle with a knurled locking screw accepts umbrella shafts up to 8 mm.