The BLSA is a 5/8" Light Stand Adapter Spigot with a milled side flat and dual bottom anti-rotation flats. The perfect accessory for our Boomerang Flash Bracket to mount larger flashes that require a 5/8 adapter such as the Profoto B1, B2, Elinchrom, Godox Heads and many more. Our ProMediaGear #BLSA Spigot is manufactured in the USA out of Stainless Steel and was machined with a few special features.