Brand Ex-Pro Ex-Pro 1/4''-20TPI Thread & 3/8'' Female Thread Adapter for Light Stand, Tripod, Flash Holder & Ballhead [2 Pack]. Heavy Duty product, manufactured from CNC Anodic machined Aluminium. Units have 1/4 20 TPI thread and 3/8 Female threads at each end, end to end the adapter is 25mm. Ide