Double End Stud (1/4''-20 & 3/8'') Adapter Spigot - 013 | Manfrotto US
Manfrotto 147 Adapter Spigot With 1/4" And 3/8" Screws | Full Compass Systems
Dellorto SHA Spigot Adapter – Dos Cycles
Amazon.com : Neewer 2 Pieces Standard 1/4 to 3/8 inch Metal Male Convertor Threaded Screw Adapter Spigot Stud for Studio Light Stand, Hotshoe/Coldshoe Adapter, Ball Head, Wireless Flash Receiver, Trigger : Electronics
NIBCO 4 in. ABS Soil Pipe Hub x Spigot Adapter C5805HD4 - The Home Depot
VMB TV-07 Spigot Adapter 55mm-29mm – Thomann United States
6pcs Spigot Stud Adapter Male Convertor Threaded Screw Standard 1/4 to 3/8 inch Metal for Hot Shoe/Cold Shoe/Studio Light Stand|Follow Focus| - AliExpress
FSI Solutions VESA to 5/8" spigot adapter
NIBCO 3 in. ABS Soil Pipe Hub x Spigot Adapter C5805HD3 - The Home Depot
Manfrotto 3/8" + 1/4" Adapter Spigot 147 B&H Photo Video